翻译句子。

昨夜你睡了多长时间？

________ did you sleep last night?

What time were you back ______ (昨天夜里)?

[    ]

　　A. yesterday evening    B. last evening

根据所给的汉语内容，用英语完成下列句子。

1.他很累，因为他昨晚熬夜了。

    He felt very tired because he ________ ________ ________ last night.

2.在我上学的路上，我帮助一个小女孩找回她的妈妈。

    ________ ________ ________ ________ school, I helped a little girl find her mother.

3.他在2008年担任了志愿者的工作。

    He ________ ________ a volunteer in 2008 .

4.我妈妈很生气，因为我撒谎了。

    My mother ________ ________ ________ me because I told a lie.

5.你应该自己去找出这个数学问题的答案。

You should ________ ________ the answer to the math question for yourself.