按要求做题。
1. They swim in the lake.(就画线部分提问)
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2. It is a present.(就画线部分提问)
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3. Happy birthday to you!(写答语)
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4. Linda goes fishing in autumn.(就画线部分提问)
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1. Where do they swim?
2. What is it?    
3. Thank you!
4. What does Linda do in autumn?
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