1. 用方框内所给词的适当形式完成下列句子（有一项多余）

be late for    heavy    possible    practise    usually loud

1. （1） They cheered for their football team.
3. （2） It is difficult on a high mountain in winter.
5. （3） It's to finish so much work in such a short time.
7. （4） It's going to rain tomorrow.
9. （5） I'm sorry for class again.