636] They made an important decision ______ the end of the meeting.

[译文] 在会议结尾时他们做了一个重要的决定。

　 A. in 　 B. by

　 C. on 　 D. at

[答案及简析] D。 at the end of 固定搭配"在…结尾"，"在…底／末"。

635] The boy was not allowed ______ his brother’s bike.

[译文] 不容许这个小孩用他哥哥的自行车。

　 A. to use 　 B. using

　 C. use 　 D. used

[答案及简析] A。 考查动词的用法be allowed to do sth.被容许做什么。

634] He _____ tasted the mixture and give a smile.

[译文] 他很高兴地尝了尝混合物然后笑了笑。

　 A. glad 　 B. gladly

　 C. was glad 　 D. was glad to be

[答案及简析] B。 副词才能修饰动词。

633] None of the students watched the teacher______.

[译文] 没有一个学生在认真听老师讲课。

　 A. careful enough 　 B. enough carefully

　 C. carefully enough 　 D. enough careful

[答案及简析] C。 enough作为副词，在修饰副词，形容词时要后置。

632] Miss Yang will teach us Chinese today ____ Mr Zhang.

[译文] 今天杨老师代替张老师给我们上语文课。

　 A. instead 　 B. instead of

　 C. to 　 D. of

[答案及简析] B。 instead 是副词；instead of是介词短语，才能跟宾语。

631] The boy wanted to ride his bike in the street, but his mother told him _____.

[译文] 这孩子想在街上骑自行车，但是他的妈妈不许可。

　 A. not to 　 B. not to do

　 C. not do it 　 D. do not to

[答案及简析] A。 省略结构，不定式做宾补时，可以带不定式省略后面的相同部分。

630] ----- What made you so upset? -----_____ my house _____ saying goodbye.

[译文] --什么使你不安呀？　--Jim离开我家时没说再见。

　 A. Jim left; without 　 B. Jim’s leaving; instead of

　 C. That Jim left; without 　 D. Jim leaving; instead of

[答案及简析] C。 该句的回答是一个省略句，还原就是：That Jim left my house without saying goodbye made me upset.句子后面的相同部分省略了。

629] We’ve a lot of things to do. But _____ we must get some sleep.

[译文] 我们有许多工作要做；但首先我们必须睡觉。

　 A. at first 　 B. at once

　 C. first of all 　 D. the first thing

[答案及简析] C。 first of all= first 首先； at first= in the beginning最初。

628] You will be late ______ you leave immediately.

[译文] 除非你立即出发不然就晚了。

　 A. unless 　 B. until

　 C. if 　 D. or

[答案及简析] A。 unless 除非；until 到…为止。

627] ----- _______ in the workshop. Please stop it. ----- Sorry. I________.

[译文] --车间里不许吸烟。请灭掉。　　--对不起。我不知道。

　 A. Smoking is not allowed, don’t know 　 B. Not smoking, an not sure

　 C. Don’t smoke, have no idea 　 D. Smoking is forbidden, didn’t know

[答案及简析] D。 "不知道"　是在对方告诉之前，故需过去时。