“Aha, you’re a chain smoker！” “Only at home. Nobody _______ that but you.”
| A．discovered | B．had discovered |
| C．discovers | D．is discovering |
- The reason_________ he didn't come was _________ he had to take care of his sick mother.
| A．why; that | B．why; which |
| C．which; why | D．that; for |
-"Please __________why you're so late," said his girlfriend.
| A．excuse | B．explain | C．apologize | D．tell |
---- Is there anyone in your class ____ the name of Mary?
----____.
| A．whose; No | B．her; None | C．by; No one | D．called; Nobody |
Swimming alone ____ be ____ dangerous. Do be careful.
| A．need, highly | B．may, high | C．can; highly | D．can; high |
There's no bus now, and we can't get home _______ by taxi.
| A．rather than | B．other than | C．more than | D．less than |