英语高手请进帮忙作选择题:15 . Whatever your opinion is , it is welcome.

英语高手请进
帮忙作选择题:
15 . Whatever your opinion is , it is welcome. Your feedback will______the improvement of our courses. (4 分)
A. contribute on
B. contribute to
C. contribute in
D. contribute for
16 . ______,many problems of space flight couldn’t have been solved. (4 分)
A. If electronic computers were not invented
B. If electronic computers are not invented
C. Had electronic computers not been invented
D. Had electronic computers been invented
17 . Many sources of information are sure to______our chances of getting in touch with the current events in the would. (4 分)
A. enhance
B. expand
C. imagine
D. limit
18 . Many freshmen cannot ______themselves quickly to college life. (4 分)
A. adopt
B. arrange
C. admit
D. adapt
19 . The sound______away little by little (4 分)
A. faded
B. disappeared
C. vanished
D. lost
20 . You are good at history, so you’d better choose one of other______ (4 分)
A. disciplines
B. regulations
C. semester
D. study
21 . I won’t go there _______ invited. (4 分)
A. Unless
B. without
C. whether
D. be not to
22 . _______ everything means to know nothing. (4 分)
A. To know
B. Knowing
C. One knows
D. You know
23 . Iris and Eliza _______ want to invite their classmates to their birthday party. (4 分)
A. they both
B. their both
C. the both
D. both
24 . The Wangs _______ visit this tea-house on weedends, but now they don’t. (4 分)
A. used to
B. get used to
C. use to
D. didn‘t use to
25 . It’s now exactly half past seven. _______ , the doctor has been here for two hours. (4 分)
A. In other words
B. In another word
C. On the other hand
D. What‘s more
谢谢!确保准确!