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18.If you ____ the book tomorrow,you will be very happy.

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18.If you ____ the book tomorrow,you will be very happy.
A.will read B.will reading C.will be reading D.read
19.She ____ read fifty poems when she was only five.
A.can B.could C.may D.must
20 She ___ last year.
A.give up smoking B.give up smoke C.gave up smoking D.give up smoking
21.My mother has ___to Hong Kong twice.
A.come B.got C,gone D.been
18,D If 从句后面用一般现在式
19,B 一般过去式表可以做什么事用Could
20,C 一般过去式用gave
21,D Been表示去过又回来了
一定没问题.