1、thank you for all the time and effort you (have) put in.(花费时间做某事)
2、The earthquake survivors are in desperate need of help. 铤而走险的，不顾一切的（adj.） /非常（程度副词）/ 极度渴望的[F][(+for)][+to-v]
3、I think this time yesterday he was having an English class in No.3 Classroom Building. （时态）
A.was having B.will have C.had D.would have
4、Frequent cultural exchange will certainly help foster (培养) friendly relations between our two universities.
5、The competition among these companies at the printing market has become very intense （激烈的）in this city.
6、It is estimated that new interaction between computers and Net technology will have significant influence on the industry of the future.（填介词）
7、As the Net pushes the economy ahead rapidly, the economy is also bringing the Net market forward. （填介词）
8、After the synthetic had been developed ,engineers had a better choice for materials for construction.
A. had been developed B. had developed
C. to be developed D. being developed
9、If you are in doubt (不能肯定的;可怀疑的) about his ability to do the task, don't entrust him with it.
10、There was a tremendous ([tri'mend?s] 巨大的,极大的) explosion, and the building fell down.