51.I don’t know whether it will rain or not, but if it ______ rain, I shall stay at home.
a. willb. did c. does d. shall
52.“You’d like some tea,______?”
a. wouldn’t youb. shouldn’t youc. hadn’t you d. didn’t you
53.“May we take the books out?”
a. No, you may notb. No, you can notc. No, you can’td. Please don’t
54.“I would have come sooner, but I ______ that you were waiting.”
a. didn’t knowb. hasn’t knownc. hadn’t know d. haven’t known
55.If you don’t want to, you ______ to get there with us.
a. mustn’tb. can’tc. don’t haved. have not
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