根据句意及汉语的提示，写出单词。

1. There is a  ___   (直接的) connection between these events.

2. Don't     ____(使烦恼) yourself with such a matter.

3. Please_______(借) me your bicycle for an hour, Andrew.

4. I   ____   (想知道) whether you would mind helping me for a few minutes.

5. He gave_____   (命令) that they should go home at once.

质量为2.7kg的正方体铝块，置于面积为1m²的水平桌面中央，则正方体铝块对桌面的压力为              N，压强为               Pa。（取g=10N／kg，ρ_铝=2.7g/cm³）