A dark cloud is a _______of rain.
Most of us see a doctor ______ when we get a cold or something.This won't cost us a lot.
May I use your bike? I'm going to see my uncle who _______ this city.
It is playing computer games _______ the boy spends most of his spare time.
---What's he size of the smaller one? ---It's _______.
---Why isn't he in the hospital with his injured mother? ---No one ______ him of the accident.