（  ）21.The continuous storm_____the harvesting of the wheat crop by two weeks.

A.set back

B.set of

C.set out

D.set aside

21.A【解析】set back“使推迟，耽误”；set off“动身”；set out“出发，启程”；set aside“留出，放到一旁”。句意：连续性暴雨使小麦收获的时间推迟了两周。故选A。

（  ）22.The famous magician，as well as his assistant，_____to perform at the China's Got Talent in 2017.

A.were invited

B.was invited

C.have been invited

D.has been invited

22.B【解析】根据时间状语in 2017可知，本句用一般过去时，故排除C、D。当主语后面接由as well as引导的名词时，谓语动词的单复数与主语一致， 所以本题的谓语动词要用单数形式。故选B。

（  ）23.The number of various environmental programs，_____important role have been realized by more and more people，has a rapid growth these years.

A.Whose

B.wher

C.which

D.that

23.A【解析】分析句子结构可知，空格处为非限定性定语从句，先行词与空后的important role为所有关系，故连接词用whose。句意：近年来，各种环境项目的数量快速增长，越来越多的人意识到它的重要地位。

（  ）24.As I opened my eyes，in_____direction I looked，I could see smiling，peaceful，calm and content faces.

A.Whatever

B.however

C.whichever

D.wherver

24.C【解析】whatever“无论什么”；however“然而，但是”；whichever“无论哪一个”；wherver“无论哪里”。句意：当我睁开眼睛时，无论我往哪个方向看，都能看到微笑、安宁、平静和满足的脸庞。in为介词，后面只能跟名词性成分，故排除B、D。根据“无论我往哪个方向看”可知whichever正确。

（  ）25.Memories from childhood stay with us forever，taking us_____we have been and will go.

A.What

B.how

C.wher

D.that

25.C【解析】句意：童年的回忆永远留在我们身边，带领我们去已经到过的和将去的地方。本句为地点状语从句，what， how和that一般不用来引导地点状语从句。故选C。