37. Dear passengers, to ensure your safety, please remain　 until the plane has come to a complete stop.

A. seated　 B. seat C. to seat　 D. seating

36. We can not help but what unknown greatness human beings have has not yet been discovered.

A.　 to wonder　 B. wonder　 C. wondering　　 D. wondered

35. The lady was beautiful and　 impressed me most was her education background that she used to do scientific research at Stanford University.

A. that B. which　　 C. where　　 D. what

34. As a young student, he recognized that　 blood required very little work and virtually no pain while helping to save a life.

A, donated　 B. donating C. donate　 D. to be donated

33. The Lijiang River was so fascinating that 1 loved it the moment_________ I got out of the coach.

A. when B. since　　 C. /　　 D. as

32. Your spoken English ____ in a way, but it still needs a great deal of practice and hard work.

A. has improved B. will be improved　　　 C. improved　 D. had improved

31. Studying in Harvard University was tough at first, but I slowly adapted myself and worked my way up, 　eventually_______ from it.

A. graduate B. graduating　 C. to graduate　 D. graduated

30. There is growing concern　　 food supplies will not be enough to feed the increasing world population.

A. that B. which　　 C. as　 D. where

29. It is very different from the. situation in the wild,　　 　　　the vast majority of camels will die or be killed before they grow up.

A. which　　 B. where　　 C. when D. what

28. We　 weigh the pros and cons before deciding whether to invest our money or let it stay in the bank.

A. can　 B. would　　 C. must D. dare