13. As soon as he graduated from college, he a_________ for a job.

12. Animals are our friends, they should live in p_______ on the earth.

11. He s__________ us locking the door while we were away.

10. In class you should pay a__________ to what your teacher is saying.

9. Did you report the l__________ of your jewelry to the police?

8. You will e__________ your health if you work so hard.

7. Man should protect w__________ for his own existence.

6.　　　 I have not heard from my brother r ___________．

5.　　　 Sea water c__________ salt.

4.　　　 There are many kinds of i_________ in the world, a bee is one kind of them.