According to the school rules, if a student _________ happen to damage something by accident,he/she should report it to a teacher or the office immediately.
______ around the Water Cube , we were taken to see the Bird’s Nest for the 2008 Olympic Games.
Her book didn’t ____ children probably because she employed too many scientific terms.
After years of research, he found the key ____ differences between species.
--- Do you know Anna’s telephone number? --- ______. As a matter of fact, I don’t know any Anna, either.
I have two elder brothers, ____ in the army for ten years.