That was a really difficult question, but a little boy____ a good idea.

Will you get there by ______ train.–No, I will take ______ taxi.

I am afraid the room is for us to live in.— Yes, it is. But let’s make do (将就) with it.

_____ is known to everybody, the moon travels round the earth once every month.

Do you notice the strange noise of the computer Maybe _____ is wrong with it.