用所給單詞把兩個句子合并成一個句子
1. Tom arrived at his school. He started his lessons.(after)
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2. It's December. It's summer in Australia. (although)
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3. The boy has a bad temper. We'd better not talk to him. (and)
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4. She was laughing all the time. Everyone thought it was funny. (that)
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5. Summer is hot here. Winter
is cold. (but)
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