Only when the villagers were faced with water shortage___ how serious the problem of water pollution was．
| A．did they realize | B．will they realize | C．they did realize | D．were they realized |
The passenger was very impolite to the conductor, , of course, made things even
worse.
| A．who | B．whom | C．which | D．what |
— Where will you start your work after graduation?
— Mmm, it’s not been decided yet. I continue my study for a higher degree.
| A．need | B．must | C．would | D．may |
surprised me most was that they had finished the talk so quickly.
| A．Which | B．Why | C．That | D．What |
private cars are bringing us convenience, they may also cause more traffic accidents
and pollution.
| A．While | B．As | C．If | D．Since |
— Can you please lend me some money?
— Sorry, I’ve got at hand myself. I’ve spent all of my money buying the computer.
| A．none | B．nothing | C．no | D．not |