1. 用and，but，or或so填空。

1. （1） We should protect the earth, we will have no water to drink.

3. （2） The pig is too big to sleep in the house， I have to make her a bigger one.

5. （3） Money is very important, it's not the most important thing.

7. （4） You have coughed for several days, Bill. Stop smoking, you'll get better soon.

9. （5） Stephen Hawking can't walk or even speak, he has become very successful.