Only when the English class began ____ that he had left his book at home.
| A．will he realize | B．he did realize | C．did he realize | D．should he realize |
She will have to _____________herself to the new condition.
| A．change | B．fit | C．adjust | D．suit |
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 |