21.What _____ pity that you couldn’t go there to receive ______ prize!
A.a; a B.the; a C.a; the D.the; the
22.According to the rules of the library, a book can _____ for three weeks, and a DVD for one week.
A.borrow B.kept C.be kept D.be borrowed
23.Generally speaking, according to the directions, _____ the drug has no side effect.
A.when taken B.when taking C.when to take D.when to be taken
24.Mary can speak Chinese fluently, _____ impressed me most.
A.why B.that C.where D.which
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