--What about the protection?
---Let’s keep the surface ____ dirty by putting a cover over it.
| A．far from | B．free from | C．apart from | D．away from |
___ your English, you’d better practice every day.
| A．Improving | B．Improve | C．To improve | D．To be improved |
My dictionary ___, I have looked for it everywhere but still __ it.
| A．has lost; don’t find | B．is missing; don’t find | C．has lost; haven’t found | D．is missing; haven’t found |
When __ alone, the child will make trouble.
| A．leaving | B．being left | C．having left | D．left |
Peter __ come with us tonight, but he isn’t very sure yet.
| A．must | B．can | C．may | D．will |
---The computer cost him 20, 000 dollars. ---It ____ be that expensive.It’s a used computer.
| A．may not | B．can’t | C．mustn’t | D．needn’t |