How much is too much for a schoolbag —Expertssay students should carry_______ more than 10 or 15 percent of their bodyweight.

Now, ________, I’m going to give you some advice on how to learn English.

I saw Li Ming standing in the teachers’ office.—Really He _______ basketball with other boys on the playground just now.

The coat is very nice. Can I ______

Wind power is an ancient source of energy ____ we may return in the near future.[ ]