求几道英语翻译

1.试题必须保密，以防作弊 （so as to)

2.他要求我们马上出发 （demand+that-clause)

3.演讲者坐在演讲厅的前面 （完全倒装）

4.他不仅自己的功课做得好，而且还经常帮助其他人学习 （not only引导部分倒装）

The exam must be kept safe so as to prevent cheating
He demands that we go right away
In the front of the hall sits the lecturer.
Not only does he do his homework well, but also helps other people study.

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