-The terrible accident is under investigation.
-Actually, quicker action __________ those workers trapped in the mine.
| A．may have saved |
| B．could have saved |
| C．must have saved |
| D．should have saved |
Several years had passed ______ I finally realized the true value of friendship.
| A．when | B．that | C．after | D．before |
It’s a mistake to think of Chongqing only ______ its tourist attractions.
| A．in addition to | B．by way of | C．in terms of | D．by means of |
All passengers ______, please fasten your seat belts and remain seated ______ the plane is landing.
| A．on board; before | B．abroad; since | C．on the board; after | D．aboard; when |
Unfortunately, it was in Yushu County, ______ a 7.1-magnitude earthquake happened on April 14, 2010, ______ a large number of students were buried inside damaged schools.
| A．which; when | B．that; that | C．where; that | D．where; which |
______ World Exposition in 2010 is the first registered World Exposition in ______ developing country.
| A．/; a | B．The; a | C．The; / | D．/; the |