Translation of "Choosing" in Chinese

You must be careful in choosing your friends.

交友须谨慎。

Teaching is a profession of my own choosing.

教书是我自己选择的职业。

I made a big mistake in choosing my wife.

我在选择妻子时犯了一个很大的错误

- It is a difficult task, choosing what is "right" or "wrong", but you have to do it.
- It's difficult choosing between what's right and what's wrong, but you have to choose.
- It's difficult choosing between what's right and what's wrong, but you have to make the choice.

选择什么是“对”或“错”是一项艰难的任务，我们却必须要完成它。

It is a difficult task, choosing what is "right" or "wrong", but you have to do it.

选择什么是“对”或“错”是一项艰难的任务，我们却必须要完成它。

If you need to use the services of a company, you may be interested to know what standards they work towards before choosing to work with them.

如果你需要使用一家公司的服務, 在選擇與他們合作之前, 你可能有興趣知道他們朝什麼樣的標準努力。