13. Scientists are convinced        the positive effect of laughter        physical and mental health.

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I am always very interested in the travelling. My rea?sons are quite simply and clear. If someone is not satisfied with my opinion,I shall be greatly surprising at his way of thinking. On the one hand,travelling increase our knowl?edge of the world. Only by travel can we visit local places of interest,listen to the story about the places and have a taste of different local foods. On the other hand,travel* ling is very good to our health. While we are travelling,we can breathe fresh air or exercise our bodies as well. Usually,people are often travelling are in good health. In a word,I sincerely hope everybody will grasp as much op?portunities as possible to travel.

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One day,I was walking along the street while a stranger stopped me and asked me the way to a new restaurant. I told him the route and direction careful. As soon as I finish,the stranger thanked me a lot of and started off. However,to his sur?prise,he went at a wrong direction. Then I stopped the men at once and told him that he was wrong. Unexpected,he smiled and told me the truth which he didn't really want to ask the way. But instead he was just trying to know whether every?one knew exactly where the new restaurant,for he was the owner of the new res?taurant.

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4. He is always clever. I wonder how it        (come) about that he should have failed the simple test this time.

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5. Found lying on the street        (breath) ，the boy was immediately taken to hospital.

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2. It is reported that the number of students        (addict) to computer games has been on the increase in recent years.

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8. The girl doesn't feel like        (have) a talk with her father about her study at school.

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1. I dislike it when others laugh at me in public or think        (poor) of me behind.

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5. Our bodies are s      by taking exercise. Similarly,our minds are developed by learning.

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