It was not until I was chosen monitor of the class ________ to realize the importance of teamwork.
| A．did I come | B．had I come. |
| C．when I came | D．that I came |
The students have been working hard on their lessons and their efforts _____ with success in the end.
| A．rewarded | B．were rewarded |
| C．will reward | D．will be rewarded |
The naughty boy _____ quickly, otherwise he would have been caught by the angry headmaster.
| A．had run away | B．ran away |
| C．should run away | D．were to run away |
From his tired face, I can tell he _______ in the queue for a long time.
| A．is waiting | B．will wait | C．will be waiting | D．has been waiting |
The company had about 30 computers but only onethird used regularly.Now we have 60 working all day long.
| A．is | B．are |
| C．was | D．were |