Chinese exports have been hit hard by falling world demand, with millions of workers _______ to their villages after the factories that employed them closed down.
| A．returned | B．returning | C．have returned | D．return |
—Tim, you are leaving for the Yellow Stone Park tomorrow. Why not pack your clothes and food up now?
—.
A Help yourself B.. Good idea
C. Go ahead, please D. Me, too
Not until all the fish died in the river, ____ how serious the pollution was.
| A．did the villagers realize | B．the villagers realized |
| C．the villagers did realize | D．didn’t the villagers realize |
The fact ________ she seemed to develop normally was very encouraging.
| A．where | B．of which | C．what | D．that |
America was______was first called India by Columbus.
| A．that | B．where |
| C．what | D．the place |
—Hey, if you can't enjoy that at a sensible volume, please use the earphone. I'm studying.
—Oh, I'm sorry. I_______ _realize it________ you.
| A．don't; bothers | B．didn't; bothered |
| C．don't; was bothering | D．didn't; was bothering |