介绍:
Mum : Let’s go to the park.
Mary: That’s great!
(shortly, in the park)
Mum: What's the matter, Mary?
M: I am tired and thirsty, Mum.
Mum: All right, what do you want?
M: May I have an ice-cream and some pop?
Mum: OK, pop and ice-cream.
(a moment later)
Mum: Here you are.
M: Yes, thank you, Mum.
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