Present Perfect Continuous

The correct answer is "living". This is because the sentence is in the present perfect continuous tense, indicating an action that started in the past and is still ongoing. The verb "live" needs to be conjugated in the present participle form, which is "living".

The correct answer is "has been studying" because the sentence uses the present perfect continuous tense to indicate an action that started in the past and is still ongoing in the present. The word "since" also suggests a duration of time, further supporting the use of the present perfect continuous tense.

The correct answer is 've been. This is the contraction of "have been," which is the present perfect continuous tense. It is used to describe an action that started in the past and is still ongoing in the present. In this sentence, the speaker is indicating that they have been working in the garden for some time.

The correct answer is 've been shopping / buy. This is because the phrase "have been shopping" indicates that the action of shopping has recently occurred, and the phrase "buy" is the correct verb to complete the sentence.

The correct answer is "'s been waiting." This is the contraction of "he has been waiting." The phrase "has been waiting" indicates an action that started in the past and is still ongoing in the present. The use of the contraction "'s" is common in informal spoken English.