of quality： 优质的。。
of beauty： 美丽的
of all kinds：各种各样的
10.A. differ B. varies C. extend D. differs
11.A. the needs B. the satisfaction C. needs D. need
Private schools in the United States __10__ widely in size， quality， and in the kind of program that are offered to meet __11__ of certain students.
10. A. 分析：考察主谓一致性原则（也涉及到习惯搭配结构）
11.A.分析：考察习惯搭配和定冠词的使用（该题也可借助上文用词解答）。
12.A. on which B. to which C. which D. what
13.A. surprise B. surprised C. surprising D. stricken
The degree __12__ American parents are active in their children’s schools is often __13__ to people of other countries.
12.B.分析：考察习惯搭配和定语从句结构。
13.C.分析：考察分词结构的使用。
14.A. consisting B. comprising C. composing D. making up
Most schools have organizations __14__ of both parents and teachers， usually called P.T.A. for parents-teacher association.
14. A. 分析：考察固定搭配结构
consist of = be made up of = comprise = be composed of v.由。。。组成
15.A. talk to B. comment C. discuss D. exchange
They meet together to __15__ various matters concerning the school. Parents often give their time to help with classroom or after school activities.
15. C. 分析：考察习惯搭配。
talk to sb. v.找某人谈话
comment on sth. v.评论。。
discuss sth. v. 讨论。。
exchange views/ideas on sth.交换对。。的观点／看法 ；exchange dollars for.。用美元换