1. 用方框中所给单词或短语的适当形式填空。

control, upstairs, wheel, environment, sand

1. （1） Let's go to watch Human and Nature.
3. （2） Have you ever ridden a bike with five ?
5. （3） —How do you like your new job?

   —I like it very much. The working is very comfortable.

7. （4） Although the model plane was not easy to , Mike won the game.
9. （5） There's soft on the beach.