6．对青少年来说得到充足的睡眠是很重要的。

5．黄河是中国的第二大河流。

The Yellow River is ________ ________ ________ river in China．

4．雨下得很大，我们的运动会不得已被推迟到下周日。

It's raining very hard．Our sports meeting has to ________ ________ ________ till next Sunday．

3．在老师们的帮助下，我顺利的通过了考试。

I have got through the exam ________ ________ ________ ________ the teachers．

2．钢笔是被用来写字的。

Pens are ________ ________ ________．

1．为了健康，青少年需要足够的睡眠。

________ ________ ________ be healthy teenagers need enough sleep．

10．Could you please keep quiet? It's too ________(noise)here．

9．Be careful! Put the secret letter in a ________(safety)place．

8．Mother often burned ________(she)while cooking．

7．We were told ________(not leave)until 6 o'clock in the afternoon．