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He …. his leg in a skiing accident last year.

A. broke

B. has broken

C. had broken

D. breaks

I wish I …….. how to upload videos from my computer to the Internet.

A. would know

B. knew

C. have known

D. will know

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.