牛刀小试

　　1. As a result of destroying the forests, a large ______ of desert ______ covered the land.

　　A. number; has

　　B. quantity; has

　　C. number; have

　　D. quantity; have

　　2. We believe ______ you have been devoted to ______ naturally of great necessity.

　　A. that; being

　　B. all that; be

　　C. that all; are

　　D. what; is

　　3. Peter rather than I ______ going to go camping this winter vocation.

　　A. am

　　B. is

　　C. are

　　D. will be

　　4. Planning ahead of time ______ no change — many things will become different next month.

　　A. made

　　B. makes

　　C. would make

　　D. has made

　　5. All possible means ______ tried, but not every means ______.

　　A. have been; work

　　B. has been; works

　　C. have been; works

　　D. has been; work