--What should I buy here? --If you have friends who smoke, Winston is a well-known ____ of cigarette here.
| A．sign | B．type |
| C．brand品牌 | D．example |
--Mr. Lee__________to a student when I entered the classroom this morning.
---He is very patient________ he is young.
| A．talking; but | B．talks; though |
| C．was talking; though | D．talked; however |
After running a 1000-metre race, he was________.
| A．out of breathe | B．breathed heavily |
| C．took a deep breath | D．out of breath |
The country life he was used to ____ greatly since 1992.
| A．change | B．has changed |
| C．changing | D．have changed |
In our school library there_______ a number of books on science, and in these years the number of them_______ growing larger and larger.
| A．are; is | B．is; are |
| C．have; are | D．has; is |
The rivers will become dirtier and dirtier________ we take action to protect them.
| A．since | B．if | C．until | D．unless |