A. The wind is blowing gently. The leaves are dancing in the wind softly. The birds are flying happily.
B. It is raining heavily. Charlie and his father have no umbrella They are running quickly.
C. The wind is blowing gently. The children are having a picnic (野餐）happily.
D. It is raining heavily. The wind is blowing strongly. Tim can't hold his umbrella.
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A. You mustn't play with matches，little boy. It's not safe. It's very dangerous.
B. Fire gives us heat and light. It can hurt people. We must be careful with fire.
C. Cover your mouth and nose and crawl out very fast if it is all smoky in a fire.
D. When you see a fire，you must go outside quickly. Don't use the lift.
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A. Water is very useful. It comes from the sea, the rain and the tap, too.
B. Mrs. Wang is in the kitchen. She uses water to wash the dishes.
C. This is my father. He is in the bathroom. He uses water to wash his face.
D. This is David. He is in the garden. He uses water to water the plants.
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A. —Is Ann reading a book? —No, she isn't. She's making a sandcastle.
B. Look at Tom. He is walking (走路）on the beach. He is very hot.
C. —Are the children collecting shells on the beach?—Yes, they are.
D. Look at John and Lily. They are flying kites in the park. They are happy.
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You mustn't litter. Don't litter.
You mustn't
