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答案：1. It's great.
解析：根據上文“How's your first day at the new school?”以及下文“I like our new classrooms.”可知，此處應是對第一天感覺的積極回應，“It's great.”符合語境。
2. what clothes are we going to wear tomorrow?
解析：根據下文“I think we are going to wear jackets and sports shoes.”可知，此處是詢問明天穿什么衣服，“what clothes are we going to wear tomorrow?”符合語境。
3. I want to join the reading club.
解析：根據上文“What club do you want to join this term?”以及下文“I love reading.”可知，此處應回答想加入閱讀俱樂部，“I want to join the reading club.”符合語境。
4. Because I like singing and dancing.
解析：根據上文“Why?”可知，此處應回答喜歡音樂俱樂部的原因，“Because I like singing and dancing.”符合語境（答案不唯一，合理即可）。
5. Sorry, I don't know.
解析：根據下文“Maybe we could ask the teacher later.”可知，此處應是說不知道俱樂部活動開始時間，“Sorry, I don't know.”符合語境。