问题补充：
Attention, please. All of you students remain in their seats until all the papers have been collected.
A. can
B. will
C. may
D. shall
答案：
A. can
B. will
C. may
(答案→)D. shall
解析：
试题分析:句意：请注意了。所有的学生们都要在座位上坐着不动直到所有的试卷都收起来。A能够；B将；C可以；D将。根据句子内容可知此处表示一种规定， shall可以表示按照法律条文、规章制度规定的内容，答案选D。
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