The pupils hurried to the classroom______ the bell rang.
It’s raining hard. We have to stay at home __________ going fishing.
—Look! That man looks like Mr Green. —It can’t be him. He _________ to America.
This is _______ empty bottle. But it is _______useful one.
When you are sleeping, you had better______ all the windows closed.
— Could you tell me ______? — Yes. It’s next to the supermarket.