1、We have to _______(限制) the expense of the trip. (set)
2、We should all ______(做出贡献) the modernization of our country. (contribution)
3、This is _______( 一个大问题); we need more time to think about it. (issue)
4、Police _______(正在调查) possible links between the murders. (investigate)
5、As we know, laziness ______(导致……失败) the exam.(lead)
6、This gave me a c_______ as to the source of the problem.
7、She said his death was a great l______to herself.
