The two researchers originally set out to study the zebras in Africa and discovered a new species of tiger ______.
| A．by chance | B．in addition |
| C．by nature | D．in need |
Do you think he would have given you a hand in your time of financial difficulty?
He ______ had he known about it. After all, we are good friends.
| A．wouldn’t have | B．should have |
| C．couldn’t have | D．must have |
－Mary, how did your Math test go?
－I had thought I _________, but in fact I came in the top 10 in my class.
| A．should have failed | B．couldn’t have failed |
| C．might have failed | D．shouldn’t have failed |
People can find so many good things, such as useful information and lovely pictures on the web, __________ it is also a global village filled with bad things.
| A．what | B．when | C．where | D．while |
The place_____ the bridge is supposed to be built should be _____ the cross-river traffic is the heaviest.
| A．which; where | B．where; in which |
| C．in which; where | D．in which; in which |
Between 1918 and 1938, many new stations were constructed,__________ was designed by an architect named Charles Holden.
| A．the most famous of which |
| B．the most famous of them |
| C．the most famous of whom |
| D．and the most famous of which |