He once worked in a company, _____ he went abroad for further study.

When I returned to my study, I found the floor thoroughly______and all my books______according to the types of books

_______ be in a rough life time, whether he is “Bai Fumei” or “Gao Fushuai.”

The poor man _____ lost his money just now is called John.

Why not stay at home ______ the road is soslippery after the heavy snow