David found that he was a bit fat these days. He went to buy an exercise machine so that he could try to lose some weight(减肥).

    At first, he put it in the basement(地下室).But he did not use it often. He seldom went into the basement.

    Next, he moved it into his bedroom. But he still didn't use it very often. That's because he would only go into the bedroom when it was time for him to go to sleep.

    Finally, he moved it into the living room. He put the machine next to the window. His wife thought maybe this would finally work. He could exercise and look outside at the beautiful garden at the same time.

    After a week or so, his wife asked David how his exercise was going. He said, "Well, yes, I do a little more exercise these days. Every time I want to open the window, I have to walk around the exercise machine."

    In China, learning some safety knowledge(知识) is becoming more and more important now. How should you keep yourself safe？

    {#blank#}1{#/blank#}

    At school：

    When students around you begin to push, try to hold onto something, or stay in a safer corner. {#blank#}2{#/blank#}

    On your way home or to school：

    Wait for the green traffic light. {#blank#}3{#/blank#} Wear clothes in bright colors, so the drivers can see you easily.

    {#blank#}4{#/blank#}：

    Stay calm and leave quickly. To keep clear of smoke (烟雾),use a piece of wet cloth to cover your mouth and nose.

    For riding on the escalator（自动扶梯）：

    {#blank#}5{#/blank#} You should hold onto handrails（扶手） and stand on the right side of the escalator, because right arms are stronger.

What do they think of doing the chores?

A. The girl's duty.

B. Keeping healthy and learning life skills.

C. Dirty and no time.

D. Boring

E. Being happy to help parents.
F. Easy and not taking too much time.