33. --I'm not finished with my dinner yet.
     --But our friends ______ for us.
A. will wait          B. wait
C. have waited    D. are waiting
答案：D
考点：本题也是在语境中考查学生对时态的灵活运用。
解析：第一个说话人说"我还没吃完饭呢"，而下面的人则说"但是我们的朋友们都在等我们了"根据第一个人还没进行完吃饭的动作，而第二个人又开始催促，我们得知朋友们此时正在等他们。所以用进行时are waiting更符合句意。
34. --I'm sorry, but I don't quite follow you. Did you say you wanted to return on September 20?
--Sorry, I ______ myself clear. We want to return on October 20.
A. hadn't made     B. wouldn't make    C. don't make      D. haven't made
答案：D
考点：时态
解析：上文说没听清是几号回来。而下文则说很抱歉我没说清楚。根据句意我们只能选didn't make或者haven't made. 那落在选项中我们只能选择D。A. hadn't made过去完成时表过去的过去，不符合题意。B. wouldn't make过去将来时时态不正确。C一般现在时不正确。
35. It took me a long time before I was able to fully appreciate what they ______ for me.
A. had done      B. did        C. would do       D. were doing
答案：A
考点：本题考查过去完成时和一般过去时的区别。
解析：整个句子时态用的是一般过去时，我能够表示感谢就已经是过去，而他们对我的帮助则是过去的过去。因此选A。
36. The book has been translated into thirty languages since it ______ on the market in 1973.
A. had come   B. has come    C. came  D. comes
答案C
考点：考查时态。
解析：since引导的从句作状语时，主句通常用完成时，而从句用一般过去时，所以选C项。
37. The palace caught fire three times in the last century, and little of the original building_______now.
A. remains    B. is remained   C. is remaining   D. has been remained
答案A
考点：考查时态。
解析：remain在这儿意思是“剩下，余留”，为不及物动词，整句话是对现在事实的陈述，所以用一般现在时。选A项。
38. -----Why do you want to work for our company?
-----This is the job that I ______ for.
A. looked B. am to look  C. had looked  D. have been looking
答案D
考点：考查时态。
解析：由句意：这就是我一直寻找的工作可知用现在完成进行时，表示从过去某个时刻发生的动作一直持续到现在，并且有可能持续下去。
39. If you plant watermelon seeds in the spring, you ______ fresh watermelon in the fall.
 A．eat          B．would eat       C．have eaten           D．will be eating
答案：D
考点：本题考查条件句的时态。
解析：根据句意：如果你在春天种下西瓜种子，你会在秋天吃到新鲜的西瓜。可以判断这是真实的条件从句，会发生的事情，所以选择will be eating表将来。
40．For many years, people ______ electric cars. However, making them has been more difficult than predicted.
A．had dreamed of     B．have dreamed of     C．dreamed of      D．dream of
答案：B
考点：本题考查时态。
解析：根据句意：许多年来，人们都一直梦想着电动汽车。然而，制造它们比想象要难得多。由此，推断此处的梦想从过去到现在，并由此延伸。目前，市场上已经有了电动汽车，所以应用现在完成时。