用所给单词把两个句子合并成一个句子 1. Tom arrived at his

题目：

用所给单词把两个句子合并成一个句子

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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