34. When I was trying to find out _____ that prevented so many birds from　returning to the north,

an unexpected visitor came.

　A. why it was 　　　　B. what it did　　 　C. what it was 　　　D. why it did

33. --Who are you waiting for?

　-- _____ the man wounded in the left leg.

　A. The doctor will operate on　B. The nurse to be looked after

　C. The doctor to operate on　　 D. His brother got

32. Only then did the children_________ the danger of taking drugs.

　　 A. aware　　 　B.aware of　　 　　　C.become aware of　 　　　D.become aware

31. People are puzzled _____ they read the book.

A.the first time　　 B.at the first time　 C.for the first time　　 D.at first

30. The engine of the ship was out of order and the bad weather____the helplessness of the crew at sea.

　A.added to　 B.resulted from　 　　　C.turned out 　　　D.made up

29. When considering how to settle the problem, the most important factor -weather, he had_________.

　A.left out　 　B.left behind　　　　 C.left off　 　　　　D.left over

28. ---Where are you going to spend your summer holiday?

　---I’ll go ________it is already cool.

　A. what　　　 B. that　　 　　　　　C. whether　　 　　D. where

27. What surprised me most was that there appeared a _____ look on her face on hearing the news.

　A. worried 　　B. being worried　　 C. worry 　　　　D. having worried

26. I shall tell her_________ that it is not any business of hers.

A.accurately　 B.exactly　　　 　　　C.firmly　　 　　　D.steadily

25. He didn't want to _______ her by asking questions she couldn’t answer.

A.alarm　　　 B.embarrass　　 　　C.envy　　　 　　　D. amuse