— Does your aunt usually walk the dog in the park?
— Yeah, bad weather stops her.
| A．when | B．since |
| C．unless | D．if |
------This is really a difficult problem.
------Yes, that’s true, but she managed to solve it.
A. failed to solve
B. liked to solve
C. succeeded in solving
When you ________, you start a journey.
A. set off B. put off C. get off
The dish smells ______ but tastes________.
A. good; bad B. well; nice C. nice; good
—Don’t leave your computer_____ if you don’t use it. Electricity is valuable.
— Sorry, I won’t.
A. on B. out C. off
The air_______ of Shenzhen in February ranked the 10th among 74major cities in China.
A. quarter B. quality C. quantity