Students ___________ remain in their seats until all the papers have been collected.

– James didn’t ____ last night, did he?– No. He ____. We had changed our plan.

—What does the sign over there read?—No person        smoke or carry a lighted cigarette, cigar or pipe in this area.

It    be difficult to get a train ticket during traditional Chinese Spring Festival this year because there are many ticket windows.

The problem is too difficult for him. He _______ solve it by himself without any help.