5.A. a B. the C. some D. /
6.A. bring B. bringing C. send D. sending
7.A. which B. what C. in that D. where
8.A. to B. in C. of D. on
9.A. / B. in C. of D. on
Americans offer __5__ great variety of reasons for doing so， including the desire of some parents to __6__ their children to schools __7__ classes tend to be smaller， or where religious instruction is included as part of the educational system， or because __8__ their opinion， the public schools in their area are not __9__ high enough quality to meet their needs.
5. A. 分析：考察定冠词的用法（固定搭配）
a variety of = all kinds of
6． C. 分析：考察语法及常见词的用法辨析。（固定搭配）
a desire for sth.对。。的渴望/ desire to do sth. 渴望做。。
比较：a wish to do sth.
7． D. 分析：考察从句与主句之间逻辑关系。空格前是名词，空格后是从句，所以首先考虑定语从句结构。
in that = because因为
8. B. 分析：考察固定搭配。
in one’s opinion ＝ in the opinion of： 依据某人的观点来看
have a good opinion of oneself自视甚高； 自信； 自高自大
have a high opinion (of sb. [sth.])(对某人[事])有很高的评价
have a low opinion (of sb. [sth.])(对某人[事])评价甚低； 轻视
in ones own way 用。方法
9.C．分析：考察常见介词的用法。