Charles regretted（）the TV set last year.The price has now come down.

—Guess what! I have got A for my term paper. —Great! You （） read widely and put a lot of work into it.

A.must
B.should
C.must have
D.should have

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Barbara tried （） in the door but （） worked.

A.every of her keys；none
B.all of her keys；not everyone
C.all of her keys；none
D.her all keys；not all

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