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Speaker A: I'm going to the park with some friends for a barbecue on Sunday. Would you like to join us? Speaker B: ______
A.
Why not on Saturday? You see, I have an important appointment on Sunday.
B.
Thanks, but unfortunately I have to take my sister to the airport on Sunday.
C.
That's a wonderful idea. Barbecue is one of my favorites.
D.
What preparation do you expect me to do for the barbecue?