No one is allowed, no matter who he is, _____ the room unless he has a permit.
| A．enters | B．to enter | C．entering | D．entered |
It is well known that Thomas Edison _______ the electric lamp.
| A．invented | B．discovered | C．found | D．developed |
One of the provinces _______ the union and formed a new country.
| A．broke away from | B．kept away from |
| C．did away with | D．cut off |
In washing this cloth, be sure to _______ the temperature of water.
| A．allow for | B．pay for | C．account for | D．answer for |
．The terrible flood swallowed the village ________ the villagers could get away. No one survived it.
| A．after | B．as | C．since | D．before |
Do you have any difficulty ___ these flowers? I’d like to help you if you need.
| A．to plant | B．for planting | C．with planting | D．in planting |