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　　Being safe at school and in your everyday life needs knowledge．If you remember the following information．your life will be much safer．

　　●Always notice the environment around you．You shouldn’t walk alone outside．　　1　　 If anything dangerous happens．you can find them quickly．

　　●Don’t use earphones(耳机)when running in the schoolyard or on the street．　　2　　

　　●School bags should be carried towards the front of your body instead of pulling them on your back．　　3　　

　　●If you are followed by a stranger(陌生人), cross the street and go in the other direction(方向)．let the stranger know that you know he or she is there．Next, go and get help from others if it is necessary．　　4　　 You a re safer on the street than you are in your home or in a lift．

　　●If you have 10 take a bus to a place far away, try to get to the bus stop a few minutes before the buses leave．　　5　　 On buses, don’t sit alone, sit behind the driver or with friends．Don’t sleep．

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　　Have you ever rubbed(擦)your hands together when they get cold? Why do we do that? We do that for friction(摩擦)．Friction happens when two things that aren't very smooth rub together to make heat energy．The faster you rub two things together, the more friction(and heat)you can make．Let's discover friction!

　　●　　1　　

Soap　Water　Your hands

●　　2　　

(1)Make sure your hands are dry．

(2)Rub your hands together until you feel the heat of your hands．

(3)Now, use soap and water to get your hands very slippery(滑的)．

(4)Try to make friction happen while your hands are slippery．

(5)Please write down what has happened．

●　　3　　 Friction is an energy that happens when two things rub together．When friction happens, it makes heat! When your hands are slippery, they won't make very much friction and your hands won't get so hot．

●　　4　　

(1)Friction happens when you stop your fast running bike．

(2)Ancient people made fire by rubbing two pieces of wood together．Friction happened though they didn't know it．

●　　5　　

Friction is everywhere．Have you ever noticed situations where friction is happening? If not, ask your parents to take you out in a car．If it is not too hot, touch the tires(轮胎)of the car before and after a short drive to see how much warmer they get from friction．

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　　Do you like Justin Bieber's song? Now, Justin is eighteen years old．The Canadian pop stars celebrated(庆祝)his 18^th birthday on March 1^st．His manager 　　1　　 him a car as a gift on his birthday．

　　Justin, however, has a gift for his fans, too．His new album(专辑)Believe

　　　　2　　 out on June 1^st．Since last year, Justin 　　3　　 some songs for the album himself．“ Everything must 　　4　　 well if I put my heart into it, ” he said．

　　The young man also feels excited about being 18．“Eighteen means a lot of responsibilities(责任)．”Justin said．“I can 　　5　　 my own decisions…Eighteen is going to be a great year．”