21It is generally believed that teaching is（）it is a science.
A.as an art much as
B.as much an art as
C.an art much as
D.much as an art as
开始考试练习点击查看答案22 Doris’success lies in the fact（）she is cooperative and eager to learn from others.
A.when
B.why
C.that
D.whether
开始考试练习点击查看答案23 You can never imagine that a well-educated gentleman（）be so rude to an old woman.
A.might
B.should
C.need
D.would
开始考试练习点击查看答案24 John wants to visit me today. I’d rather he（）tomorrow.
A.came
B.come
C.are coming
D.will come
开始考试练习点击查看答案25Mr. Wells has found some new clues in his investigation, （）of great importance to solve this criminal case.
A.I think which is
B.that I think is
C.which I think is
D.which I think it is
开始考试练习点击查看答案26Susan is（）as an “addlehead”一she always leaves her keys on the door.
A.who is known
B.which is known
C.whom is known
D.what is known
开始考试练习点击查看答案27Workers in big firms receive a substantial part of their pay in the form of（）andovertime.
A.prizes
B.bonuses
C.rewards
D.gratuities
开始考试练习点击查看答案28It is customary to （） one’s resignation one month before one’s last day.
A.turn down
B.turn out
C.turn up
D.turn in
开始考试练习点击查看答案29The general manager told his secretary that he suffered from heart disease, but he would notadmit it in（）.
A.secret
B.private
C.public
D.detail
开始考试练习点击查看答案30The general asks the soldiers many questions to keep them on their toes. The underlined partMeans（）.
A.curious
B.busy
C.focused
D.alert
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