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They _____ a movie when the power went out.

A. were watching

B. watched

C. watch

D. have watched

The building _____ roof was damaged is being repaired.

A. who

B. whom

C. whose

D. that

Which past modal verb is used to express a regret or criticism?

A. May have

B. Might have

C. Should have

D. Could have

Virtually . . . cells in the human body contain DNA in their nuclei.

A. they are all

B. all are

C. all

D. they all