------You ran into Mr. Li! How did that happen? ------Well, _______ of us was looking where we were going. We came around the corner at the same time.
.I was about to leave _____ the telephone rang.
Children under 10 are not permitted _____ the film.
The bird hid _____ food inside trees for the winters.
--What do you think of the play? --Oh, excellent! It’s worth a second time.
The computer system suddenly while he was searching for information on the Internet.