21.—Better get down to your work, Jack.
— .
A.It’s my pleasure B.Not to mention it
C.Mind your own business D.You’re welcome
22.I ________ be slow, but at least I don't make stupid mistakes.
A.must B.need C.should D.may
23.The company provides cheap Internet access._______, it makes shareware freely available.
A.In addition B.In brief C.In return D.In common
24.We went to Mountain Tai last weekend, ________, not surprisingly, was crowded with visitors.
A.that B.which C.where D.when
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