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[that little square piece of paper that sticks in (9) …….. a clever way that it can be removed]
2.
[leaving no damage – (10) …….. becoming an essential piece of stationery worldwide.]
3.
[(11) …….. so many other simple inventions, the Post-it note was invented by accident]
Explanation The word "like" is used here to indicate that the statement mentioned in the question is similar to the given answer. It suggests that just like many other simple inventions, the Post-it note was also invented by accident.
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4.
[A scientist working for a US company was attempting to develop a super-strong adhesive, (12) …….. instead came up with a super-weak one.]
Explanation The word "but" is used to indicate a contrast or contradiction between two ideas or statements. In this context, it suggests that despite the scientist's intention to create a super-strong adhesive, they ended up creating a super-weak one instead. The word "but" highlights the unexpected outcome or deviation from the original goal.
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5.
[It was just strong (13) …….. to stick light objects together.]
Explanation The word "enough" is the correct answer because it completes the sentence and makes it grammatically correct. The sentence suggests that the strength was sufficient to stick light objects together.
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6.
[What was special about it was that the objects could be separated (14) …….. leaving a mark.]
Explanation The word "without" indicates the absence or lack of something. In this context, it suggests that the objects mentioned in the previous statement could be separated or removed without leaving a mark.
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7.
[(15) …….. five years, he tried convincing his bosses of the importance of his invention.]
Explanation The correct answer is "for, over." This is because the sentence is referring to a period of time, specifically five years, during which the person tried to convince their bosses of the importance of their invention. The words "for" and "over" are both used to indicate a duration of time.