My new novel has disappeared.Who _______ have taken it?
| A．should | B．must |
| C．could | D．would |
Despite the rise in importance of major regional languages such as Chinese, Arabic or Spanish, to ever think that the development of English can now be stopped seems totally unrealistic．
| A．voices tell | B．voices told | C．voices’ telling | D．voices telling |
President Bush was in Omaha this morning to deliver a speech, but he the city by the time the shooting took place．
| A．left | B．had left | C．had been leaving | D．would have left |
If the researchers are successful, they an important step in reproducing the way that humans use cognition（认识力）to interact（交流；互动）in their world．
| A．make | B．would make | C．will make | D．will have made |
—Yeah, but not now, Tom． —Okay, I．
| A．just ask | B．have just asked | C．am just asking | D．was just asking |
The next generation of telescopes will reveal（显露；揭示）new parts of our universe that will seem surprising, just as the moon’s craters（坑） when observed 400 years ago．
| A．could seem | B．might seem |
| C．should have seemed | D．must have seemed |