1. 以下每个句子中有一处错误，请找出并改正。

1. （1） Mary is a teacher and her job is teach students English.
   
3. （2） There is potentially danger in drunk driving.
5. （3） The people of our various nationalities enjoy absolutely equality before the law.
7. （4） I'd love to be introduced to the man worn a business suit.
9. （5） Compare with the size of the whole earth, the biggest ocean does not seem big at all.
11. （6） I was about to go out while the telephone rang.
13. （7） The weather was fine, so we made up our mind going for a picnic.
15. （8） Comparing Tom with Jack, you will find the later clever.
17. （9） Having told many times, he still couldn't understand it.
19. （10） The eruption of this volcano has caused fewer damage than you might imagine.