646] Do you have trouble ______ the post office?
[译文] 找到邮局你有困难吗？
A. to have found B. with finding
C. to find D. in finding
[答案及简析] D。 have trouble/difficulty in doing sth. 做什么事费力，费劲。
645] Tom tried to make his parents _____ by making faces.
[译文] Tom想用装怪像的方法使他的父母高兴。
A. pleased B. pleasing
C. please D. to please
[答案及简析] A。 及物动词的过去分词表示状态。
644] -----May I speak to Mr Tom, please? ----- I’m afraid he isn’t in. Would you like to ______ a message?
[译文] --请Tom接电话好吗？ --他不在。你留个口信行吗？
A. take B. write
C. leave D. tell
[答案及简析] C。 leave a message留口信。
643] -----Do you usually take a vacation? -----Yes, I like to go away______.
[译文] --你喜欢度假吗？ --是的，我喜欢远出一年一次。
A. one time this year B. once a year
C. one time a year D. one time in a year
[答案及简析] B。 次数 + a year/ month/ week 是常用固定搭配，表示一年／月／周一次。
642] Her boy friend is a tall young man _____ glasses. He likes to ______ a face.
[译文] 她的男朋友是一个带着眼镜的高个子年轻人。他喜欢装怪像。
A. wear; make B. wears; makes
C. with; make D. wearing; making
[答案及简析] C。 第一个空用介词短语，表示伴随；第二个空缺一个动词原型。
641] Please ______ that you have closed all the windows and turned off the lights before you leave the room.
[译文] 在你离开房间之前请查一下你是否把所有的窗子和灯都关上了。
A. make sure B. be sure
C. bring out D. hold up
[答案及简析] A。 be sure 有把握，确信；make sure 务必，一定，千万。
640] When he was sixty years old, he _____ his hometown.
[译文] 当他60岁的时候，他就回到了他的故乡。
A. returned B. returned back
C. returned to D. went back
[答案及简析] C。 return 归来，回来，不再和副词back连用。
639] ______ you understand the rule, you can do it well.
[译文] 你一旦理解了规则，你就会把它做好。
A. For B. As
C. Once D. While
[答案及简析] C。 once连词，引导状语从句，"一旦"。
638] The room ____ voices of the children.
[译文] 房间里充满了孩子们的声音。
A. filled with B. was filled with
C. full of D. was full with
[答案及简析] B。 be filled with "充满"。
637] I can hardly heat the radio. Would you please ______?
[译文] 我几乎听不到收音机了。请把他开大一点好吗？
A. turn it on B. turn it down
C. turn it up D. turn it off
[答案及简析] C。 turn up 开大一些；turn off关掉； turn on 打开；turn down关小一些。