________ all of them are strong candidates,only one will be chosen for the post.(2011·陕西,19)
He gave the old couple a lot of money and didn’t expect to receive anything ______for them.
The math problem seems very easy, but in fact it is very difficult_______.
-----What did you think of Mount Tai? ------Wonderful. It’s worth ______once again.
In the past twenty years, the sad father has been to many places-______his lost son.
—Isn’t that Ann’s husband over there?—No, it ______ be him-I’m sure he doesn’t wear glasses.