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

（51）　　．

At school：

When students around you begin to push，try to hold onto something，or stay in a safer corner．（52）　　．

On your way home or to school：

Wait for the the green traffic light．（53）　　．Dress in bright colors，so the drivers can see you easily．

（54）　　：

Stay calm and leave quickly．Use a piece of wet cloth to cover your mouth and nose so that you don't breathe in smoke．

For riding on the escalator（自动扶梯）：

（55）　　．You should hold onto handrails（扶手） and stand on the right side of the escalator，because right arms are stronger．

A．When there's a fire．

B．Here are some tips for you．

C．It is dangerous to run up and down on the escalator．

D．If you see a car coming，don't across until it really stops．

E．If you fall down in a crowded place，cover your head with both hands．