The survey shows that 200 students do different things during their vacations. ______ of them take classes according to the survey.

Why do English people talk so often about the weather when they start a talk? — Because the weather is a(n) ________ topic (话题).

If it ______ tomorrow we’ll go to the park. [ ]

Bill’s mother ________ much time in cooking every day.She can cook delicious food.

If it ______ tomorrow, I will stay at home and do some cleaning.