Digital cameras are becoming very popular, though some still _____ too much.
A.pay | B.spend | C.sell | D.cost |
Don’t make me _____ this or that. I’m too busy!
A.to do | B.do | C.doing | D.done |
“Can you sing the song in English?” “No , I _________”
A.may not | B.mustn’t | C.needn’t | D.can’t |
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