补全对话。
| A．Where is Sam? |
| B．What's he doing there? |
| C．Where are Lingling and Amy? |
| D．What are they doing? |
A: ______________
B: They're there.
A: ______________
B: They're playing hide-and-seek.
A: ______________
B: He's behind the tree.
A: ______________
B: He is playing hide-and-seek with me.
A: Ha ha…
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