There ___ life on the earth for hundreds of millions of years.
A. has been B. is having C. have been
Don’t come into the lab ________ you are asked to.
| A．unless | B．until | C．because | D．since |
My uncle has been taught in this school _______ he was twenty years old.
| A．since | B．for | C．until | D．after |
Don’t worry, sir. I’m sure I can run _____ to catch up with them.
| A．fast enough | B．enough fast |
| C．slowly enough | D．enough slowly. |
The sports meeting _________ until next month.
| A．didn’t hold | B．won’t hold |
| C．doesn’t be held | D．won’t be held |
--Could you tell me ?
| A．how I can get to the library |
| B．where can I find the library |
| C．how can I get to the library |
| D．where is the library |