– The terrible accident is under investigation.
--Actually, quicker action _____ those workers trapped in the mine.
| A．might have saved | B．must have saved |
| C．should have saved | D．could have saved |
The new rule has been working effectively since it __________.
| A．comes into existence | B．was come into existence |
| C．came into existence | D．was coming into existence |
As a result, these endangered animals may even __________.
| A．die away | B．die down | C．die out | D．die off |
__________ time goes on, our country becomes more and more powerful.
| A．With | B．Since | C．While | D．As |
The newly discovered star was named __________ a Chinese astronomer __________ honor of his contributions to astronomy.
| A．for; in | B．after; for | C．as; in | D．after; in |
The government has agreed to pay the firms extra sums to __________ for their financial losses.
| A．make up | B．bring up | C．fill up | D．look up |