39. Parents should take seriously their children’s requests for sunglasses _________ eye protection is necessary in sunny weather.

　　 A. because　　　　　　　　　 B. through　　 　　　　　 C. unless　 　　　　　　　 D. if

38. Jasmine was holidaying with her family in a wildlife park _____ she was bitten on the leg by al lion.

　　 A. when　　　　　 　 B. while　　　　　 C. since　　　　 　　 D. once

37. After Yang Li wei succeeded in circling the carth, _______ our astronauts desire to do is walk in space.

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

36. American women usually identify their best friend as someone _____ they can talk frequently.

　　 A. who　　　　　 　　 B. as　　　　 　　　　　 C. about which　　　 D. with whom

35. The disc, digitally ______ in the studio, sounded fantastic at the party that night.

　　 A. recorded　　　 　　 B. recording　　　　　　　 C. to be recorded　　　 D. having recorded

34. The flowers ____ sweet in the botanic garden attract the visitors to the beauty of nature.

　　 A. to smell　　 　　　　 B. smelling　　 　　　　 C. smelt　　　 　　　　 D. to be smelt

33. The flu is believed _______ by viruses that like to reproduce in the cells inside the human nose and throat.

　　 A. causing　　　　　 B. being caused　　　　　 C. to be caused　　　　　 D. be have caused

32. He speaks English well indeed, but of course not _____ a native speaker.

　　 A. as fluent as　　　　　　 B. more fluent than　　 C. so fluently as　　　　 D. much fluently than

31. Bill’s aim is to inform the viewers that cigarette advertising on TV is illegal, _______?

　　 A. isn’t it　　　　　 　 B. is it　　　　　 　　 C. isn’t be　　　　　　　　 D. is he

30. The number of deaths form heart disease will be reduced greatly it people _______ to eat more fruit and vegetables.

　　 A. persuade　　　　 B. will persuade　　　　　 C. be persuaded　　　　 D. are persuaded