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1·You'd better work hard from now on, or you will fail in the exam.

你最好从现在开始努力学习，否则你会考试不及格的。

2·The whole class listened silently, because they were afraid to fail in the exam.

全班都静静地听，因为他们害怕考试不及格。

3·He used to fail in the exam.

他过去经常考试不及格。

4·I think he will fail in the exam.

我想他考试会不及格。

5·I'm afraid I'll fail in the exam.

恐怕我考试会不及格。

6·You may fail in the exam.

你可能会考试不及格。

7·Any one of us could fail in the exam.

我们当中的任何一个都可能考试不及格。

8·Study hard, or you'll fail in the exam.

好好学吧，否则你考试就会不及格。

9·He is disappointed to fail in the exam.

他因考试不及格而很失望。

10·Study hard or you may fail in the exam.

不努力学习就可能会考试不及格。