They have made so great progress .
| A．three years ago | B．for three years |
| C．in the past three years | D．before three years |
The earth is years old.
| A．four thousands six hundreds | B．four thousand six hundred |
| C．four thousand and six hundred million | D．four thousand six hundred millions |
I afraid of the dark, but now I don’t.
| A．use to | B．used to | C．use to be | D．used to be |
—
— To the supermarket with Wang Fan.
| A．Where have you gone? | B．Where did you go to the supermarket? |
| C．Where have you been? | D．Where’s Wang Fang? |
Finally, save your document before you ________ your computer.
| A．turn on | B．turn up | C．turn off | D．turn down |