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Why is Ian sitting ….. the corner on his own?

A. on

B. at

C. in

Combine the sentences (informal)!

This is the computer. The repairman worked on it yesterday.

A. This is the computer on which the repairman worked yesterday.

B. This is the computer which the repairman worked on it yesterday.

C. This is the computer which the repairman worked on yesterday.

D. This is the computer on that the repairman worked yesterday.

But if you are a teenager who criticizes your parents for their … of technological awareness, don’t be too hard on them!

A. research

B. experiment

C. effect

D. lack

He then worked on peaceful applications of __________ that can substitute fossil fuel for a clean environment.

A. navigation

B. mantle

C. mutations

D. nuclear energy.