10. put out 扑灭

9. as a result 结果

8. insist on 坚持

7. leave alone 不理会

6. take a chance 冒险

5. in vain 徒劳

4. cool off 变冷

3. get / betired of 对……感到厌倦

2. every now and then 不时地

1. look into 调查