I am waiting for my friend. , I will go swimming alone.
The heavy rain ______ the old man from going out for a walk. Which one is not right?
The flood ____________ the villages and a lot of people lost their lives.
I know the ________of the bird because it's one of the________ birds in the world.
---How long did it ________you to solve the problem?---I _______about half an hour on it.
---Could you come back home at three o’clock?---_________. I will have a meeting at half past two and it will last two hours.