The correct answer is "It was near the water filter so he was bobbing about in the air bubbles." This sentence has correct subject-verb agreement in the past tense. "It" is a singular subject, so it should be followed by the singular verb "was." Similarly, "he" is a singular subject, so it should be followed by the singular verb "was."

The correct answer is "Yes, they are. But big things can be cute too. Now, hurry up, I'm going to miss my train." This sentence correctly uses subject-verb agreement by using the plural form of the verb "are" with the plural subject "they." Additionally, the pronoun "I" is correctly used with the contraction "I'm" to indicate the first person singular subject.

In the given question, the correct answer is "In the morning, Abby jumped out of bed and switched on the light in her fish tank." This sentence is in the past tense and maintains consistency throughout by using "jumped" and "switched" in the correct past tense form. The other options have errors in tense usage, such as using "switch" instead of "switched" or using "jumps" instead of "jumped".

The correct answer is "No one knew how Mr. Sticky got in the fish tank." This sentence uses the correct past tense ("knew" and "got") to describe an event that happened in the past. The other sentences use incorrect tenses: "No one know" (should be "knew"), "Mr. Sticky gets" (should be "got"), and "Mr. Sticky get" (should be "got").

The correct answer is the third option: "Just as well if he's going to be gobbled up like that," her mum said, trying to put on her coat and eat toast at the same time. This sentence is the only one that has correct punctuation. It uses lowercase for the pronoun "he" and begins the dialogue with a lowercase letter. It also correctly uses quotation marks to indicate the spoken words.

The correct answer is "I have not. Although he is extremely small, I was very careful." This sentence is written with correct capitalization and punctuation. The first letter of the sentence is capitalized, the proper noun "he" is capitalized, and there is proper use of a period at the end of the sentence.

The correct answer is: In the corner of the picture, Abby wrote her full name, Abigail, and drew tiny snails for the dots on the 'i's. The teacher said that was very creative.

This sentence is the only one that follows proper capitalization rules. "Abby" is capitalized at the beginning of the sentence, "Abigail" is capitalized as a proper noun, and "teacher" is not capitalized since it is not being used as a specific name or title. The other options have mistakes in capitalization, either in the names or in the title "teacher".

The correct answer is "The door to the bedroom opened and mum's face appeared around the crack." This sentence is free from any spelling mistakes.

The correct answer is "He is very small," mum said as she peered at the tiny water snail. This sentence uses the correct tense for a narrative story set in the past. The verb "said" is in the past tense, and the verb "peered" is also in the past tense, indicating that the action took place in the past. The use of the present tense verb "is" is incorrect in this context, as it should be in the past tense to maintain consistency.

The correct answer is the last sentence: "But I don't want him to get too big or he won't be cute anymore. Small things are cute, aren't they?" The subject "small things" is plural, so it agrees correctly with the plural verb "are." Additionally, the pronoun "they" is used correctly to refer back to "small things."

The correct answer is "Mr. Sticky stayed out of the way, clinging to the glass while mum used the special 'vacuum cleaner' to clean the gravel." This sentence is the only one that capitalizes the first letter of the name "Mr. Sticky" and the pronoun "Mum," which is the correct punctuation for a narrative story set in the past.

The correct answer is "I'm beginning to suspect the pond weed, don't you think?" This sentence is the only one that does not have any spelling mistakes. The word "beginning" is spelled correctly, and "suspect" and "think" are also spelled correctly. The other sentences have spelling mistakes such as "begining" instead of "beginning," "suspet" instead of "suspect," and "tink" instead of "think."

The correct answer is "That night, Abby turned on the light to find Mr. Sticky clinging to the very tiniest, waviest tip of the pond weed." This sentence uses the past tense consistently throughout the narrative story, indicating that the events happened in the past. The other sentences either use present tense (turns, clung) or mix present and past tense (turn, clinging), which is incorrect for a narrative story set in the past.

The correct answer is "On the side," mum said. She was busy concentrating on the water. "Don't worry I was careful." This sentence follows proper punctuation rules in a narrative story set in the past. The capitalization of "Mum" is correct, and the sentence ends with a period. Additionally, the dialogue is enclosed in quotation marks, and the words "Don't worry" and "I" are capitalized correctly.

The sentence "There, tucked in the curve of the archway, perfectly hidden against the dark stone, sat Mr. Sticky." is the correct answer because it does not have any spelling mistakes.

The correct answer is "And right next to him was another water snail, even smaller than him." This sentence is the only one without any spelling mistakes. The word "another" is spelled correctly, and "than" is used instead of "then" to make a proper comparison.

The correct answer is "Her mum was in the study surrounded by papers. She had her glasses on and her hair was all over the place where she'd been running her hands through it." This sentence is grammatically correct and does not contain any spelling mistakes.

The correct answer is "I think he's grown a bit," Abby told her mum at breakfast the next day. This sentence has the correct subject-verb agreement. The subject "I" agrees with the verb "think" and the verb "he's" agrees with the subject "he."

The correct answer is "There're a lot of algae on the sides," Mum said. "I'm not sure Mr. Sticky's quite up to the job yet." This sentence has a mistake in subject-verb agreement because "There're" should be "There's" to agree with the singular noun "a lot." The other options also have mistakes in subject-verb agreement.

The correct answer is "At school that day, Abby drew an elephant. She needs two pieces of expensive paper to do both ends but the teacher didn't mind because she was pleased with the drawing and wanted it on the wall." This sentence uses the present tense ("needs") instead of the past tense ("needed") which is incorrect for a narrative story set in the past.