He's doing very well at school.
他在学校里学习很不错。
We are doing our best with the limited resources available.
我们利用可获得的有限资源，尽最大的努力。
Keep going like that ─ you're doing fine.
就这样做下去——你做得蛮不错嘛。
What is he doing calling at this time of night?
他干吗这么晚了还打电话？
What do you think you're doing?
你以为你在干什么？
Don't go doing anything extreme like leaving the country.
千万不要做出诸如离开国家之类的极端行为。