词型转换。

1. helpful (名词)_________      2. noise (形容词)                  

3. both (反义词)_________      4. real (副词)_________

5. use (形容词)_________       6. thought (动词原型)                 

7. teeth (单数)_________         8. die (名词)_________

9. gold (形容词)_________     10. health (形容词)