1.
2.
3.
4.
5.

【解析】：
这是一道信息还原题，主要考查学生对文章逻辑关系的理解能力以及前后文联系的能力。题目要求从所给的选项中选出能填入空白处的最佳选项，使得文章上下文逻辑通顺。解题关键在于准确理解每个空白处前后文的意思，并找出与之相匹配的选项。
1. 第一个空白处前文提到“House fires cause many deaths each year and a large number of these fires are unfortunately set by children.”，后文提到“Kids must understand that they'd better not play with fire.”，因此此处需要填入一个能够连接前后文的句子，强调教育孩子不要玩火的重要性。选项E“So, it's important to teach them that fire is a tool, not a toy.”符合语境。
2. 第二个空白处后文提到“The main job of such an alarm is to protect you while you're asleep.”，说明此处需要填入一个能够引出烟雾报警器话题的句子。选项G“A smoke alarm greatly reduces your chances of being hurt in a fire.”符合语境。
3. 第三个空白处前文提到“A smoke alarm warns you of the danger.”，后文提到“Take action immediately.”，说明此处需要填入一个描述烟雾报警器作用但同时指出其局限性的句子，以引出后文的紧急行动。选项B“But when you hear it, you don't have much time.”符合语境。
4. 第四个空白处后文提到“Change the batteries at least once a year. You should use the test button each month to see if the alarm and batteries are still working.”，说明此处需要填入一个关于烟雾报警器维护的句子。选项C“A smoke alarm is only good if it's working properly.”符合语境。
5. 第五个空白处前文提到“About two out of three fire deaths happen in homes with no working smoke alarms.”，说明此处需要填入一个能够总结全文并强调烟雾报警器重要性的句子。选项A“Most of these deaths can be avoided.”符合语境。
【答案】：
1. E；2. G；3. B；4. C；5. A。