---Shall we meet at 6:00 or 7:00? ---________.
It is thought that one billion people in the world, _______is half the word’s workers, earn their living by farming.
I wonder ______ you were doing last night.
______ won’t be long ______ National Day comes.
I’m afraid nobody but his parents or Jim, his best friend, _____ the secret.
At that time, he spent as much time as he can _______the ancient status which would be sank in the river.