10．Afraid of losing____________face before his classmates，the boy refused to admit having cheated in____________exam.

　　A．the；the B．the；an

　　C．/；the D．/；an

　　解析：　lose face是固定短语，意为"丢脸"；the exam特指这次考试。

　　答案：　C

　　11．Students are always thinking of sitting____________in front of computers instead of studying hard in classrooms.

　　A．at ease B．in general

　　C．by chance D．in advance

　　解析：　in advance提前；in general一般来说；by chance偶尔；at ease舒服地，自由自在地。句意为"学生总是想着自由自在地坐在电脑旁，而不是在教室里苦读"。根据句意，A为正确答案。

　　答案：　A

　　12．At the meeting，the doctors discussed some different____________to the operation on the boy's head.

　　A．approaches B．means

　　C．methods D．ways

　　解析：　四个选项均可表示"方式，方法"，但用法不同。approach和介词to搭配，构成approach to sth./doing sth.；means一般用于by means of doing sth.结构中；method一般用于(with the) method of doing sth.结构中；way一般用于way to do sth.或way of doing sth.结构中。句意为：在会上，医生们讨论了给那个男孩做头部手术的不同方法。

　　答案：　A

　　13．The engine____________well for nearly 10 years before it broke down last month.

　　A．functions B．was functioning

　　C．has been functioning D．had been functioning

　　解析：　function所表示的动作发生在从句动作broke down之前，是"过去的过去"，故用过去完成时。再结合for nearly 10 years可知用过去完成进行时强调function动作在broke down之前一直进行。

　　答案：　D

14．His little brother is such a(n)____________boy that he is always asking questions.