I live in a city where jobs are difficult to get and finding well—paid jobs is even1 . Many people have to walk a long way to work 2 they can't even afford an old, used car.

    Yesterday I 3one of these people when I was driving home. A man was walking down the road and trying to ask for a 4 from the passing cars. Two cars in front of me passed him by. 5wanted to do the same but the sight of that poor man remained in my mind for quite a moment. 6 I drove back and gave him a ride.

    As I drove along, we had a conversation and I 7 that the man was trying all his best to support his 8 while working a temporary(临时的)job. Every coin he had was going to 9 the house and food.

    But as we came close to the house he was living in, I saw his tired eyes grow 10. His little girl was playing in the front yard and 11 into her daddy's arms as soon as he was out of the 12 . I was almost lost in that happy moment. I smiled, said 13 to them and wished them future happiness. Then I 14.

    That day, the journey home which used to seem so 15 became very short.

 A、B、C、D、E、F是初中化学常见的物质，A、B是含有相同元素的无色液体，D是最轻的气体，F是红色固体单质．根据如图的相互转化关系判断．

（1）A物质是____ 填化学式）．

（2）写出B→D的化学方程式____ 　．

（3）写出D和E反应的化学方程式____　．

读图并回答问题。