阅读短文，回答问题。
Chen: What are you going to do this weekend?
Sarah: I'm going to plant trees.
Chen: Are you going to use any books?
Sarah: Yes. I'm going to the bookstore. I'm going to buy a magazine about plants.
Chen: That's great!
Sarah: I want to be a science teacher one day!
1. What is Sarah going to do on the weekend?
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2. What is Sarah going to buy in the bookstore?
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3. What does Sarah want to be in the future?
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