A.study; of whom B.study; of whom

　　C. studying; of them

　　D.studying; of whom

　　15. ---John and I will celebrate our fortieth wedding anniversary next month .

　　----On, _________!

　　A. cheer up

　　B. well done

　　C. go ahead

　　D. congratulations

　　16. So funny did he look that everybody at the English party ________laughing.

　　A. burst out

　　B. burst into

　　C. burst forth

　　D. burst with

　　17. The door _______open and in rushed the crowd, shouting with anger.

　　A. pushed

　　B. knocked

　　C. forced

　　D. burst

　　18. As soon as she saw her boyfriend, she ______tears.

　　A. burst into

　　B. broke out

　　C. burst out

　　D. broke in

　　19. If ________in wet sand, the vegetables can remain fresh for a long time.

　　A. being buried

　　B. having buried

　　C. buried

　　D. burying

　　20._____ __in deep thought ,Jack didn’t notice a car racing towards him .

　　A. Burying

　　B. To bury

　　C. Having buried

　　D. Buried

　　21._____what you said, he could have completed the work ahead of time.

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