--I’m sorry I broke your mirror.--- Oh, really? ____________. 
#23595
A
It doesn’t matter .
B
Not at all
C
It’s OK with me
D
Don’t be sorry
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--- Lily, you’re so kind to help me. Thanks a lot.--- ____________.
#21049
A
Certainly not.
B
My pleasure.
C
With pleasure.
D
Take it easy.
— I'm afraid I can't finish the book this week.  — ____. 
#4298
A
Please go ahead
B
That's right
C
Not at all
D
Take your time
— What a heavy rain! Will it last long?—           . We’re getting into the rainy season now.
#21995
A
Of course not
B
I’m afraid not
C
I’m afraid so
D
That’s impossible