He is businesslike（认真的）and is often _______. I hope he will have more _______ at his business.

I’ve promised to keep it secret so I Can’treally tell you anything——what you know already

The course normally attracts 20 students per year, ___________ up to half will be from abroad.

Expo 2010Shanghai China, a grand-scale global event, has ______ the significant theme“Better City, Better Life”

It’s easy enough ______ out this problem. You needn’t go to the teacher.