问题补充：
During the examinations we are supposed to remain in our seats, fix our eyes on the papers, to anyone.
A. instead of speaking
B. and not to speak
C. rather than speak
D. but shouldn’t speak
答案：
A. instead of speaking
(答案→)B. and not to speak
C. rather than speak
D. but shouldn’t speak
解析：考察句子结构。本题实际上考察的是be supposed to do sth的否定式和省略形式。在横线上本来应该是are supposed not to speak to anyone。本句实际上是三个谓语结构的并列：are supposed to remain in our seats, fix our eyes on the papers, and are supposed not to speak to anyone。句意：在考试指，我们应该坐在自己的位置上，把眼睛集中在试卷上，而不应该和别人讲话。故B正确。
