Howmuch is _______ for a schoolbag —Experts say studentsshould carry_______ more than 10 or 15 percent of their body weight

There are 30 classrooms ____________ our school. Mine is _____________ the second floor.

With a lot of homework _________last weekend, Tom didn’t go to the movies with his friends.

____ by taking part in practice can the young people be toughened and hardened into steel

__________are these trousers ——They’re ￥200.