题目内容：

完成句子

1.有困难时，我们可以向警察求助。

We can ________ the police ________ ________ when we have trouble.

2.这个学校的老师关注孩子们的安全。

The teachers in this school ________ ________ ________ the safety of the children.

3.老师一个单词一个单词地读那些句子，以便我们能够记下来。

The teacher read the sentences ________ ________ ________ so that we could write them down.

4.虽然他犯了很多错误，但是最后他成功了。

Although he ________ ________ ________， he succeeded at last.

5.我们正在想方设法提高阅读速度。

We are trying to increase our ________ ________.