—_______have you known each other? —Since we were in our childhood．
| A．How far | B．How often |
| C．How long | D．How soon |
Let’s try our best ________ the earth.
A protect B. to protect C. Protects
It is cold outside today. You’d better______ your jacket.
A. put on B. put up C. take off
Although Tina is as _____ as Tim, she runs _______.
A. tall, faster B. taller, fast C. tallest, fastest
I want to go with you ,______ I have to take care of my little sister at home.
A. and B. but C. Or
---How far is it from your home to the supermarket?
--- About twenty-five _____ walk.
A. minutes B. minutes’ C. minute’s