_______ with the size of the whole earth, the biggest ocean does not seem big at all.
| A．Compare | B．When comparing | C．Comparing | D．When compared |
------I don’t know why he has made such a silly mistake in the exam.
------ He ____________ it before he handed in the paper.
| A．may have checked | B．might check |
| C．must have checked | D．should have checked |
Read the passage a second time, ___________ the meaning won’t become clearer to you.
| A．and | B．so | C．or | D．but |
When she finished her story, none of us said anything about it, which made her feel rather ________.
| A．embarrassing | B．embarrassed | C．embarrass | D．embarrassment |
E-mail, as well as phone calls, _____________ an important part in daily communication.
| A．are playing | B．is playing | C．have played | D．has played |
If we don’t take steps, some rare animals, such as the Tibetan antelopes and pandas will ____________ some day just as dinosaur.
| A．die out | B．die away | C．die down | D．die off |