. --- 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 |
33. The little boy is very clever _____ every subject.
| A.at | B.in | C.about | D.On |
32. When the Chinese delegation arrived at Vienna airport, they were received _____ cheers.
| A.in | B.for | C.on | D.With |
31. Einstein didn’t care for money. Once he used a check _____ $1000 as a bookmark and then he lost it.
| A.for | B.of | C.about | D.To |
30. More than 20 years ago he was badly wounded in the anti-Vietnam war. Since then he can only walk _____ an arm-chair .
| A.in | B.on | C.by | D.Over |
29. Can you say _____ certain when he will come here?
| A.at | B.for | C.with | D.In |