—The problem isn't difficult for the children to work out, is it? —_____ . Perhaps they should have been given a more difficult one. 
#3913
A
Yes, it is
B
Yes, it isn't
C
No, it is
D
No, it isn't
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—The party is a great success. We've had a good time.—______!
#22097
A
It doesn't matter
B
No , just so so.
C
It's not very good
D
I'm glad to hear that