15. He asked her to        (嫁)him,but she refused.

14.       (化学)was her favorite subject at school.

13. My mother        (点头)to show that she agreed with me.

12. How much do you know about the development of medical        (技术)？

11. Everyone should take__________ (行动)to protect our environment.

10.______ (尽管)he was tired, he didn't stop to have a rest.

9. Can you make a        (句子)with "nobody"？

8. There is something wrong with the       (车轮）of the car.

7. You needn't shout at him because he is      (聋的）.

6. Water is important, and it is the       (血液)of our earth.