题目内容：

根据对话意思和所给首字母，写出完整正确的单词

As everyone knows, (1) e______________ fast walk or slow walk does good to the muscles and lungs of human. So people walk to build up their body, or to lose (2) w_____________. But only some of them know that taking a walk every day is also good for (3) p______________ man’s heart. Heart attack has become the first disease in the world (4) b_____________ more and more people suffer from it.

Taking a walk can improve the blood supply to our hearts. If you try to walk as (5) o___________ as possible, you’ll have a healthier heart.