你等了很久吗？

Have you been waiting ___for ___long?

每半小时就有一班车去市中心，所以你不用等很久。

There're departures every half an hour to the city centre, so you won't have to wait ___for ___long.

他没待很久，因为他有另一个约会。

He didn't stay ___for ___long because he had another appointment.