题目

阅读下面一篇短文，用动词的适当形式填空(必要时加上情态动词或助动词)     I have a good friend. Her name is Li Ying. She is twelve years old now. She is a good girl and often does good deeds, Here is a story about her.     It   1   (be) a very hot day. The sun was shinning brightly. Li Ying and I were going to see a film. On our way to the cinema, we  2    (see) an old lady  3   (sit) on a street corner. She didn't look well. So we stopped  4   (go) up to her. “Is anything wrong, Granny? asked Li Ying. Yes, I... I've hurt my right foot, and I'A～M分别是初中化学常见物质，其中C的固体俗称“干冰”，只有B、E、G是单质，①～⑤为上述物质的相互转化关系（反应条件已略去），这5个反应过程中出现了“产生气泡”、“生成白色沉淀”、“固体颜色变化”、“发光放热”、“有浅绿色溶液生成”等现象．①A+B→C  ②D→B+E   ③C+L→F+D  ④A+K→C+G  ⑤G+H→E+M（1）写出下列物质的化学式：B______、C______、F______．（2）写出有关反应的化学方程式②______；④______；⑤______．