2 . 离开教室前, 请确保关掉所有的电源。
Please ________ ________ all the power is turned off before you leave the classroom.

4 . Don’t worry, you won’t miss her. She will be wearing a red T-shirt and a white skirt at that time. (英译汉)

5 . 如果犯了错就要改正, 如果没有, 就要防范。
Correct mistakes if you have made any and ________ ________ them if you have not.

6 . If they do not ________ (摄入，吸收) enough food, they may feel sick. (根据汉语提示完成句子)

7 . Once you find a fire,________(尽快拨打119). (根据汉语提示完成句子)

8 . Do not ________ (放弃). You should work harder to solve the problem. (根据汉语提示完成句子)

9 . 别管那个男孩，他可以自己拿主意。
________________ the boy________________, and he can make up his mind by himself.