— My children are always arguing. — ____  
#3997
A
Just leave them alone.
B
That’s right.
C
Are you sure?
D
How old are the boys?
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—Your bookcase is very nice. —                    .
#21507
A
OK
B
Well, it's very nice
C
Thank you
D
No, it isn't
—I've got some wonderful news.We have been invited to the palace ball.—Really?______.
#3971
A
I don't believe so
B
I believe not
C
I can't believe it
D
I don't believe it
---Mum, I’m leaving for the party and I’m not coming back for dinner.      ---______, dear son!  
#22907
A
Be careful 
B
Have fun
C
Come back early
D
Don’t make trouble