根据短文内容，回答问题。
My name is Chen Lan. My home is in Gulangyu. Where is Gulangyu, do you know? It is in Xiamen.
It is near the sea (海). Gulangyu is a small place, but it is very nice and clean. There are no cars, no buses
and no bikes. People only walk. So it is very quiet.Our house is in the middle of Gulangyu. Behind our house
there is a big old tree. My grandfather tells me the tree is very old. There are many birds in the tree. We call
it "bird tree".
Our house is near the sea. The sea is big and blue. There are a lot of fish in the sea. After school, I go
there and catch fish with my friends. It is very interesting. I like eating and catching fish.
1. Why do people only walk in Gulangyu?
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2. Where is the "bird tree"?
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3. What color is the sea?
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4. Are there any fish in the sea?
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5. What's in the old tree?
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