重点词汇

1. allow sb. to do sth. 允许某人做某事

2. allow doing sth. 允许做某事

3. make sure 确保

4. keep... from 阻止

5. keep away... from 避免接近；远离

6. talk back 回嘴；顶嘴

7. regret to do sth. 很（试读）...