--- Will he come? --- I am not sure ___he will come, but I never doubt ______he will help us.
We have some books. But we need________.
They clapped and shouted______ when they saw YaoMing appear on the playground.
Which is___________ season in your hometown?
When he walks_______ my desk,he knocked my books________ the desk.
Her father was too tired_________ too much hard work.