---______ does he go to Guangzhou on business? ---Three or four times a year.
I like sleeping with the window open ______ it’s too cold.
When the teacher came in, the students stopped _______ and became very ________.
Don’t worry about Peter. He is _______ to get over the problem.
—How about raising money for the poor children in our school? — .
I think teenagers should do some meaningful things instead of ________ too much.