If human beings had been a bit less greedy and cruel, more birds and animals dying out.
| A．ought to avoid | B．could have been avoided |
| C．should have avoided | D．might have avoided |
_______ was known to them that the boss had broken his promise______ he would give them a rise.
| A．What; what | B．It; which | C．It; that | D．As; that |
Some experts are warning that the step the US government has taken to deal with the current crisis between China and Japan is ______ of much risk.
| A．one | B．those | C．that | D．ones |
—Will you please repeat your idea?
—Certainly. But I think it convinced you ________ your attention.
| A．didn’t pay | B．aren’t paying | C．don’t pay | D．weren’t paying |
Can you make a sentence to______ the meaning of the phrase?
| A．show off | B．turn out | C．bring out | D．take in |
—Tom should have been warned not to cheat in the exam.
—_______, but he wouldn’t listen to me.
| A．So he had | B．So has he | C．So was he | D．So he was |