They ______ all over the country. So they plan ______ some other country.
| A．have traveled, visit | B．traveled, to visit |
| C．traveled, visiting | D．have traveled, to travel |
I_____ to school by bike, but now I ______.
| A．used to go; used to walking |
| B．used to go; am used to walk |
| C．used to going; am used to walk |
| D．used to go; am used to walking |
___ the teachers in their school is about 200 and one fourth of them are ____ teachers.
| A．A number of; women | B．A number of; woman |
| C．The number of; women | D．The number of; woman |
— When shall we go?
— It hasn’t been decided yet. It ____ the weather.
| A．begins with | B．leads to |
| C．depends on | D．thinks of |
I don’t know _____ he will come or not. _____he comes, I’ll tell you.
| A．if; If | B．whether; Whether |
| C．whether; If | D．if; Whether |
We ___ use mobile phones when the plane takes off.
| A．may not | B．shouldn’t |
| C．needn’t | D．mustn’t |