It was an extremely difficult and dangerous task.

这是一项极度困难的危险的工作。

We must work out some plan to increase our sales.

我们必须制定一些计划来提高销售成绩。

I doubt it.

我表示怀疑。

She is an honor to our school.

她是我校的光荣。

If you compare her work with his, you'll find hers is much better.

要是把他们俩的工作比较一下，你就会发现她的好得多。

When the clock strikes twelve at midnight.

当午夜十二点的钟声敲响时。