?It's 9 o'clock now. I must go.　　

?It's raining outside. Don't leave ________ it stops.

A. when

B. since

C. while

D. until

Let's have a rest, ________ ?

A. do you

B. shall we

C. will you

D. won't you

Tell me something about your family, ________ ?

A. do you

B. don't you

C. haven't you

D. will you

________ the population of China?

A. How many is

B. How much is

C. What

D. How large is

My brother is good at learning ________ his brother is good at learning, too.

A. or

B. and

C. while

D. but

Our country is unlike yours, ________ ?

A. does it

B. doesn't it

C. aren't they

D. isn't it

That is a good idea, ________ ?

A. is that

B. isn't that

C. is it

D. isn't it

?________ does your brother go back home?

?Every other day.

A. How often

B. How long

C. How many

D. How much

I think everybody likes to go, ________ ?

A. don't I

B. aren't they

C. don't they

D. don't he

?________ has he been a teacher?

?Ten years.

A. How soon

B. How far

C. How long

D. How often