哪几个区的卫生工作做得好？
which districts are doing the best health work?
哪叫吃亏，哪叫上算，全都谈不到。
What is loss? What is gain? Either way, it's not worth talking about.
我们这里有两位张同志，你要见的是哪一位？
We've got two Zhangs here. Which one do you want to see?
这里哪一位是李同志？
which one is Mr Li?
这些书里哪一本是你的？
which one of these books is yours?
你哪天回来？
what day are you coming back?
这是哪一位的东西？
who does this belong to?
这是哪一年的事？
what year did this happen?
你是哪一省人？
which province are you from?
这样的机会不知哪年哪月才会有呢！
I don't know which month and which year this opportunity will finally come up!