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Old Jack goes to see a doctor．The doctor looks over(检查)him carefully and says，"Medicine can't help you．You must have a good rest．Go to a quiet place for a month．Go to bed early，drink some milk，walk a lot and smoke one cigar(抽一支雪茄烟) a day. "Thank you very much，"says old Jack．"I can do everything you say．''

Four weeks later，Old Jack comes to the doctor again．"Well，"says the doctor．"I am glad to see you．You look much younger．''

"Oh，doctor，"says Old Jack，"I feel quite well now．I have a good rest．I go to bed early．I drink a lot of milk and walk a lot．Your advice(建议)helps me．But you ask me to smoke one cigar a day，and it nearly kills me at first．It is no joke(笑话)to smoke at my age．"

    People，animals and plants all live on the Earth．The Earth turns around itself once 24 hours．This is why there is a day and a night Oil the Earth．The Earth goes around the sun once a year for giving us different seasons．The moon moves around the Earth．The sun is much bigger than the moon．But the moon looks bigger than the sun because it's much nearer to the Earth．The sun is very bright．It gives out a very strong light．The moon looks quite bright，too．But it can't give out any light at all．

    Mr and Mrs Smith live in China. They are from England. Mr Smith was a teacher many years ago. He taught English. But now he doesn't work. Mrs Smith was a dancer. She danced very well. She is retired(退休了)，too. She can make cakes. Yesterday she made a cake.

Is Ada a good singer?

Grace and Ada are sisters. One day, Grace hears Ada singing in the living room.

Grace: Your voice surprised me.

Ada: I spent ten thousand yuan on singing lessons.

Grace: I would love to introduce my friend Tom to you.

Ada: Does he like singing too?

Grace: No. He is a lawyer. He can get your money back.