When Andrew arrives home, he finds a man in his room. He realizes the man is a thief(贼).

David is swimming with Peter. Suddenly, he finds that Peter goes down below the surface of the water. When Peter is saved out of the water, he can't breathe.

The bed shakes suddenly while Li Lei is sleeping. In no time, he realizes an earthquake is happening.

Jack hears the fire alarm while he is working in an office building. He is on the fifteenth floor. The fire now is spreading quickly from below.

Jim is climbing a high mountain with his friend. Unluckily, he is hurt by a sharp rock on the leg. The wound is bleeding（流血）.

A. Don't keep your eyes working for a long time. Take a break by looking far into the distance after you have studied an hour or so.

B. Cover the wound with a piece of clean cloth and press it hard for at least five minutes to stop losing blood. Then go to see a doctor at once.

C. Lay him on his back on the ground. Give him mouth-to-mouth breathing right away. At the same time, call 120 as soon as possible.

D. Be calm and quiet. Call the police for help, The most important thing is to protect yourself well before the police arrive.

E. Move to a safe place in the room quickly such as under a strong table. Stay away from windows, large mirrors, heavy furniture and so on.

F. Drink more water every day. Wear sunglasses whenever you go out in the sun. These will keep the skin(皮肤) around your eyes away ,from wrinkles(皱纹).

G. Cover your nose and mouth with wet cloth. Escape from a fire exit(出口). Don't use the lift. Don't open a hot door. And stay close to the floor when you escape.