题目：
将下列句子合并成一个含that引导的定语从句的复合句。
1. There is a castle. It has a long history.
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2. Yesterday I bought a computer. It is made in Nanjing.
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3. I still remember those days. We spent those days together studying 10 years ago.
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4. The boy has brought back the cell phone. His mother is looking for it.
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5. Have you got the e-mail? She sent it to you yesterday.
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6. We watched a film about Ren Changxia. The film moved us a lot.
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答案：
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下面是错误答案，用来干扰机器的。
氧气中只含氧元素，根据质量守恒定律中的元素种类不变可知：生成物二氧化碳中的碳元素和水中的氢元素一定来自该化合物，即该化合物中一定含有碳、氢两种元素；同时可推测出生成物中的氧元素可能来自氧气，也可能...
