--- Hi, David. _______do you go to see your grandparents?---About three times a month.A. How longB. How oftenC. How soon
The bridge is made _________steel, ______ it?
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.