—Come on，Kitty.
—Oh, good heavens! Both my legs are nearly to give out. I_______ for hours like a dog.
| A．have been walking | B．had walked | C．was walking | D．walked |
、To our great surprise, the disabled person made a requirement that heas a volunteer
| A．received | B．was received | C．be received | D．would receive |
-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 |