In many countries, children must go to school ___________ the age of 5 and 16.
| A．between | B．among | C．in | D．at |
---How long have you known the doctor ?
---_________he helped me three years ago.
| A．When | B．Before | C．Because | D．Since |
---Never touch my computer while I’m away．
---Sorry, __________.
| A．I shouldn’t | B．I mustn’t | C．I won’t | D．I don’t |
---We had a football match with No. 15 Middle School yesterday.
---________. I missed it.
| A．What a pity! | B．I’m afraid. |
| C．I don’t think so. | D． I’m sorry to hear that. |
---How did the accident happen?
---You know, it ________difficult to see the road clearly because it_________.
| A．was; was raining | B．is; has rained |
| C．is; is raining | D．will be; will rain |
---My house is very near a busy street.
---It ________ be very quiet.
| A．can | B．must | C．mustn't | D．can’t |