1. 用方框内所给词的适当形式完成下列句子（有一项多余）

help    earthquake   spell   go    keep quiet     under

1. （1） Please be careful of these new words.
3. （2） Unluckily, this man lost his wife and two children in the .
5. （3） — Where are you going next weekend?

   — I haven't decided where .

7. （4） I think this book is to your English study. You'd better buy it.
9. （5） , because the baby is sleeping.