-Is that a ruler?-No, ______________.
#20256
A
it is
B
it isn’t
C
that is
D
that isn ’t
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- It’s a pity that none of these educational CD-ROMs is suitable for me.-______. I can show you some others.
#20276
A
That’s all right.
B
Why not say so?
C
No problem.
D
Don’t worry.
---I will go to Paris on my vacation. --- ______ 
#20232
A
Can I join you?
B
Have a good time.
C
Really?How was it?
D
Good idea.
—If I speak this way, could you hear me clearly?   --__________
#19948
A
Go ahead.
B
Never mind.
C
I hope not.
D
What for?