It's a rule for all the students to their places ahead of 5 minutes waiting for the clas

问题补充：

Its a rule for all the students to their places ahead of 5 minutes waiting for the class to be started.

A. take up

B. pick up

C. keep up

D. give up

答案：

(答案→)A. take up

B. pick up

C. keep up

D. give up

解析：

试题分析:A从事，进入或占据（位置）；B拾起，捡起，接收信号，偶然学会；C保持；D放弃。句意：对于所有学生来说提前十五分钟就坐，等着上课是一种惯常的做法。由句意可知答案选A。