We will have more money to spend after we ____ our mortgage (贷款).
| A．pay off | B．pay for | C．pay on | D．pay down |
31. The decision ______ Internet addiction（成瘾）as a mental disorder has caused much debate.
| A．to classify | B．classifying |
| C．being classified | D．to be classified |
30. As we watched the panda, we stood still, ______ to one another.
| A．dared hardly to whisper | B．hardly daring to whisper |
| C．dared not to whisper | D．not dared whisper |
29. Contrast may make something appear more beautiful than it is when ______ alone.
| A．seen | B．to be seen |
| C．being seen | D．having been seen |
28. At a rough look, the area of the city is about ______ the old one.
| A．three times the size as | B．three times the size of |
| C．three times that is | D．three times what is |
27. The Grand Theatre in Shanghai is open to visitors during the daytime ______ there is a performance going on.
| A．when | B．except for |
| C．except when | D．Except |