12．----Have you got any brothers ____ sisters?

　---- I have a sister.

　A．nor

　B．or

　C．but

　D．for

11．Work hard, ____ you'll catch up with others.

　A．and

　B．but

　C．or

　D．for

10．____ human beings(人类) ____ animals can live without air.

　A．Not only; but also

　B．Both; and

　C．Either; or

　D．Neither; nor

9．Mr. Zhang felt very tired, ____ he needed a good rest.

　A．and

　B．so

　C．or

　D．but

8．____ Saturday ____ Sunday is OK. I will be free in these two days.

　A．Either；or

　B．Neither； nor

　C．Both; and

　D．One; the other

7．I help him ____ he helps me. We help each other (互相)

　A．but

　B．and

　C．or

6．Go along the road, ____ you'll find the market at the end of it

　A．when

　B．and

　C．or

　D．though

5．Hurry up, ____ you won't catch the early bus.

　A．but

　B．and

　C．or

　D．so

4．Miss Gao is badly ill, ____ she is still working very hard.

　A．but

　B．and

　C．so

　D．or

3．----Will you be free on Saturday morning ?

　 ----No, I won't , ____ I'll be free on Monday afternoon.

　A．but

　B．for

　C．and

　D．so