Most of the big hotels in Shanghai were full last week, But finally we ______find a room in a small one.
| A．ought to | B．could | C．were able to | D．might |
Only when___________ according to the directions can the medicine be quite effective.
| A．taking | B．taken |
| C．being taken | D．having been taken |
To be successful, you need to remember that ___________you might be very busy, you need to be energetic and enthusiastic.
| A．as though | B．in case |
| C．even if | D．now that |
Not until all the fish died in the lake __________ how serious the pollution was.
| A．did the villagers realize | B．the villagers realized |
| C．realized the villagers | D．do the villagers realize |
A student at a Nevada middle school opened fire on campus, wounding two l2-year-old boys and__________ a math teacher.
| A．kill | B．killing |
| C．killed | D．to kill |
It never will rain roses. __________ we want to have more roses. we must plant trees.
| A．When | B．Unless |
| C．Until | D．While |