People also love trying to memorize the digits of pi and {#blank#}1{#/blank#} against others to see who can remember the most. Many teachers hold class{#blank#}2{#/blank#} to see how many numbers their students can memorize. The Guinness World Record for{#blank#}3{#/blank#} the most digits of pi is held Suresh Kumar Sharma of India, who successfully recited pi out to 70,030 decimal places.

    Above all, Pi is about having fun with the number. People celebrate Pi Day by eating or throwing pie and with pi-related games and activities. This year, Princeton, New Jersey, held a birthday party for Albert Einstein whose birthday also{#blank#}4{#/blank#} on March 14. There was also a "Walk a Pi Event "where people walked 3.14 miles together. Just like the number itself, the possibilities for Pi Day are truly endless.

    “Thank you” is widely{#blank#}1{#/blank#}in a modern society. It is a very good manner. You should say “Thank you”{#blank#}2{#/blank#}others help you or say something kind to you. For example, when someone{#blank#}3{#/blank#}the door for you, when someone says you have done your work well, when someone says you have{#blank#}4{#/blank#}a nice shirt, or your city{#blank#}5{#/blank#}very beautiful, you should say “Thank you”. “Thank you”is used not only between friends,{#blank#}6{#/blank#}between parents and children, brothers and sisters, husbands and wives.

    “Excuse me”is{#blank#}7{#/blank#}short polite usage. We use it the same as “Thank you”. When you hear someone say so behind you, you'll get to know that somebody wants to walk past you without{#blank#}8{#/blank#}you. It is not polite to interrupt (打断) others while they are{#blank#}9{#/blank#}. If you want to have a word with one of them, please say “Excuse me”{#blank#}10{#/blank#}, and then begin to talk. You should also do so when you want to cough or make any unpleasant noise before others. Let's say “Thank you” and “Excuse me” on the right occasion.

    Tigers are very strong and scary. We may see tigers in Europe, Asia and America in the mountains. The tigers live far away from {#blank#}1{#/blank#} houses. They eat birds, hares (野兔) and other small {#blank#}2{#/blank#}. In the day they hide in the dens (巢穴), and at night they go out {#blank#}3{#/blank#} food.

    In {#blank#}4{#/blank#} when tigers are hungry, they will become very {#blank#}5{#/blank#} But now, people cut down many {#blank#}6{#/blank#}, so tigers are losing their homes. Also, some people kill tigers to get {#blank#}7{#/blank#} fur. Some people even buy things made {#blank#}8{#/blank#} tiger bones (虎骨). So the number of tigers {#blank#}9{#/blank#} getting smaller and smaller.

    Animals are our {#blank#}10{#/blank#} friends. In order to protect them, we must build many natural reserves. And we must stop people from hunting.