21.As is known to us all，_________ life in_________ modern world is easier in some ways than_________ life our grandparents lived.
A.the;a;the B.a;the;the C./ ;the;the D.the;/ ;the
21.C 【解析】life in the modern world指“当今世界的生活”，life为泛指，modern world应为特指;第三空“我们祖辈们过去的生活”为特指。
22.—Would you like to play basketball with us?
—Yes，_________ I'd love to.I'm afraid I have no time.
A.So B.But C.or D.And
22.B 【解析】略。
23.He said，“We_________ be proud of working hard.We mustn't be lazy.”
A.must B.needn't C.may D.can't
23.A 【解析】略。
24.—The blue skirt looks very nice.May I?
—Yes，_________ please.
A.try them on B.try it on C.take them off D.take it off
24.B 【解析】略。
25.—Was it not until last week _________ he decided to give up smoking?
—No.He began_________ he saw the news film last month.
A.when;as soon B.that;immediately C.did;that D.that;till
25.B 【解析】第一空为强调句，强调until引导的从句;第二空immediately相当于as soon as，the moment，directly，instantly等连接词。
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