Only after you take part in the College Entrance Examination ______ that twelve years’ hard work isworthwhile.[ ]

My brother plays ______ basketball well but he doesn’t play _______ piano well.

How do you think of our new English teacher? — _____her clothes, she must be very strict.

The workers will go on strike if the demands they put forward are turned down. [ ]

Can you guess ______ the new schoolbag yesterday—Sorry, I’ve no idea.