“Do you have any questions ________ clear to you?” the teacher asked.

Shirley, I know you ___________ a book about China, Have you finished it?— Not yet. Maybe next year.

It is impolite to_____those persons in trouble.[ ]

She should have been informed of the meeting.—______，but she wouldn’t like to attend this meeting.

It’s half past four. School is over. The children___ games happily on the playground.