Penicillin was then produced ________ in order to meet the demands of the armies.
| A．in large amounts | B． in large plenty |
| C．in large quantities | D． in large number |
—When shall we restart our business ?
—Not until we our plan .
| A．will finish | B．are finishing | C．are to finish | D．have finished |
When changing lanes , a driver should use his turning signal to let other drivers know .
| A．he is entering what lane | B．which lane he is entering |
| C．he is entering which lane | D．which lane is he entering |
you may have , you should gather your courage to face the challenge .
| A．However a serious problem | B．Whatever a serious problem |
| C．However serious a problem | D．No matter how a serious problem |
We last night , but we went to the concert instead .
| A．must have studied | B．should have studied |
| C．could have studied | D．studied |
I’m sure that your letter will get attention . They know you’re waiting for the reply .
| A．continued | B．immediate | C．careful | D．general |