China is developing fast. That's ________ I think those of my colleagues who deal with China affairs should visit China.
| A．because | B．why |
| C．when | D．how |
-Come on, please give me some ideas aboutthe design.
| A．filling | B．filled | C．to fill | D．being filled |
Microblog（微博） with so many people is sure to influence our society..
| A．familiar | B．popular | C．similar | D．particular |
They became friends again that day , Until then, they to each other for nearly two years
| A．didn’t speak | B．haven’t spoken | C．hadn’t spoken | D．haven’t been speaking |
、Tom is a top student in our class , Howit be that he was a failure in the last exam?
| A．can | B．should | C．may | D．nust |
、-How about summer camp?-I should say it wassuccess.
| A．a;a | B．the;不填 | C．a;不填 | D．the;a |