No one in the department but Tom and I that the director is going to resign（辞职）.
| A．knows | B．know | C．have known | D．am to know |
—Was it in April, 1970 that China ________ sending its first satellite into space?
—Yes, that's right.
| A．succeeded in | B．managed to | C．attempted in | D．tried to |
As you know，it is my duty to________my younger sisters from being hurt when they are in danger.
| A．prevent | B．save | C．stop | D．protect |
If no measures are taken, the special wild plant will ________ some day.
| A．die out | B．die away | C．die down | D．die off |
Sir, you ________ take this seat. It’s just for the old.
| A．won’t | B．can’t | C． oughtn’t to | D．needn’t |
He spoke as though he________ anything of the world.
--Really?
| A．knew | B．had known | C．knows | D．has know |