根据图文提示，补全句中所缺单词。
1. In this photo, the sun is __________.
The birds ______________ in the trees.
2. A: ________ are you wearing a raincoat?
B: Because it’s __________ rain.
3. A: How many hours did Yang Liwei spend in space?
B: ________ _______ about ___________ hours in space.
4. I’m very sad _______ _______ goodbye to you.
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