. ______ hard. You are sure to succeed!
A. Working B. Work C. Worked D. To work
There was a time _____ hunger was a disturbing problem in this area.
A. how B. when C. that D. why
His _____ expression suggests that the news he read just now must be _____.
A. excited; exciting B. excited; excited
C. exciting; exciting D. exciting; excited
It is _____ that Professor Smith will give us a lecture tomorrow.
A. possibly B. probably C. likely D. maybe
_______ his research, man can set foot on the moon now.
A. Because B. Thanks to C. So as to D. In addition to
第四部分：单项选择（共10小题，每题1分，共10分）
______ for our teachers, we’d never have been able to enter this university.
A. Had it not been B. Had it not
C. If it was not D. If he had not been
