It’s really difficult to ______ what he is trying to express.
A. leave out B. break out C. put out D. make out
We all felt a sense of ______ when we saw so many overseas Chinese coming back safe and sound from Libya.
A. security B. relief C. emergency D. achievement
Scientists say it may be five years ______ it is possible to test this medicine on human patients．
A. since B. until C. before D. when
Last month, the Japanese government expressed their thanks for the aid they ______ from China.
A. receive B. had received C. have received D. are receiving
If you _____ smoke, please go outside because this is a non-smoking office.
A. must B. should C. can D. may
––Who would you rather _____ your graduation ceremony tomorrow, your parents or friends?
––All of them.
A. will have attended B. have attended C. attended D. to attend
