A同学学习化学后知道，镁在氧气中燃烧会生成白色的氧化镁固体．但他在空气中点燃镁条时，却发现在生成的白色固体中还夹杂着少量的淡黄色固体．

提出问题为什么会生成淡黄色固体？

查阅资料该同学查阅资料，记录了右

表中几种物质的颜色：

（1）其他同学认为不必查阅氯化镁的颜色，理由是____ ；

（2）提出猜想分析资料，A同学认为淡黄色固体可能是由镁与空气中的____ 反应生成的；

（3）实验探究该同学设计实验证实了自己的猜想，他的方案可能是　将点燃的镁条伸人充满氮气的集气瓶中，观察是否生成淡黄色的固体　；

（4）实验结论根据该同学的实验结果，写出镁条在空气中燃烧时发生的两个反应的化学方程式：____ 、____ 　；

（5）反思与评价通过上述实验，你对燃烧有什么新的认识？____ ．

增加：在缺词处加一个漏字符号（∧），并在此符号下面写出该加的词。

删除：把多余的词用斜线（＼）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意：⒈ 每处错误及其修改均仅限一词；

⒉ 只允许修改10处，多者（从第11处起）不计分。

    My uncle lives no far from my home and I visit him every Sunday. Yesterday I visited him with my sister by bikes. As usually, we stayed at his home for a very longer time. We talked about things that had been happened in my school last week, especially the low grades I had got. He encouraged me believe in myself but work harder. The talk with him really cheers me up. He also prepared a delicious meal for us. We three had the good time together. After leave his house, we rode home happily.

漫画《你会吗》启示我们，在生活中(       )

The fact that so many people still smoke          that we need a nationwide campaign _________ the awareness of the dangers of smoking.