D. least

　　7. He found his house broken into and many things stolen _______ his return from office.

　　A. with

　　B. in

　　C. at

　　D. on

　　8. It will be at least three weeks________ he recovers from his illness and returns to work.

　　A. before

　　B. when

　　C. since

　　D. after

　　9. In order to attract more customers, many supermarkets usually sell their goods at a good________ at weekends.

　　A. benefit

　　B. discount

　　C. interest

　　D. cost

　　10. It is said that this is the biggest lab ________ they have ever built in their school.

　　A. which

　　B. what

　　C. 不填

　　D. where

　　11. The job was a great challenge and the bad weather _________ our difficulties．

　　A. added to

　　B. added

　　C. added up to

　　D. added in

　　12. According to an old story, Leif followed Biarni’s directions and sailed to _______ is believed to be the coast of present-day Canada.

　　A. where

　　B. which

　　C. what

　　D. that

　　13. Often，even a common thing of the past can ________ the image of life in the ancient time.

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