Can you explain ________ the sun goes down in the west?
| A．why is it that | B．why it is that | C．how it is that | D．how is it that |
An awful accident____________, however, occur the other day.
| A．does | B．did | C．has to | D．had to |
According to the report, people in the ________ areas are rebuilding their homes and many roads ________ to the area have been repaired.
| A．flooded; lead | B．flooding; leading | C．flooding; to lead | D．flooded; leading |
---It is terrible to see the nuclear power accidents happen.
--- That’s right. Nuclear safety should be paid attention ______ to benefit the people _______harm them.
| A．/; more than | B．to; rather than | C．to; other than | D．/; better than |
Equipped with modern facilities, today’s libraries differ greatly from __________.
| A．ones of the past | B．the past | C．that of the past | D．those of the past |
—Jenny，how did your math exam go?
—I thought I ________，but in fact I came in the top 10% in the class.
| A．might have failed | B．couldn’t have failed | C．should have failed | D．mustn’t have failed |