£¨   £©1.I like comedies because actors are always very funny and they make me______.

A. to laugh       B. laughing          C. laugh                      D. laughed

£¨   £©2.Don’t forget to ______ the lights before you leave the classroom.

A. turn down      B. turn on        C. turn off          D. turn up

£¨   £©28.Attention, please! All the mobile phones  ______ during the meeting.

A. must keep off   B. have kept off     C. are keeping off      D. must be kept off