The biggest problem for most plants, which ______ just get up and run away when threatened, i
s that animals like to eat them．
| A．can’t | B．shan’t |
| C．needn’t | D．mustn’t |
In order to get the exact result, the scientists made _______.
| A．a lot tries | B．to do experiments | C．trial and error | D．great try |
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 |