老师要求我们写一篇关于环境问题的500字作文。

The teacher asked us to write a 500-word ___composition on environmental issues.

我得完成一篇英语作文来补上我上周错过的工作。

I have to complete a ___composition in English to cover the work I missed last week.

考试中，学生必须准备一篇关于他们最喜欢的书的短文。

For the exam, students must prepare a short ___composition about their favourite book.