15.　 ____________-(措施) should be taken to prevent pollution.

14.________(精神上的) wound is harder to heal than physical wound.

13. We need a lot of m_____(音乐) instruments to give a concert.

12. Martin Luther King was _______ (谋杀)because of his work for the black.

11. Who will be elected _______ (班长)of our class, Peter or Bob?

10. I am sorry that I took your umbrella by ______.(错误)

9. An experienced teacher should acquire various teaching ________.(方法)

8. To our great astonishment, he wrote down the long poem from _________.(记忆)

7. Which _______(材料) is this blanket made of, wool or cotton?

6. To _______ (掌握)a language skillfully, you should practise more.