Each zebra has its own unique pattern of distinctive stripes (带), just {#blank#}1{#/blank#}humans have their own unique pattern of fingerprints, Zebras stick together in herds (兽群). Within a herd, zebras tend {#blank#}2{#/blank#} (stay) together in smaller family groups. Families are generally made up of a male, several females{#blank#}3{#/blank#}their young.

    As zebras graze, they use their sharper front teeth to bite the grass, and then use their duller back teeth to crush and grind. A zebra's teeth keep growing for{#blank#}4{#/blank#} (it) entire life, because constant chewing{#blank#}5{#/blank#}(wear) them down.

    Zebras are{#blank#}6{#/blank#} (constant) on the move to find fresh grass and water. Sometimes they gather in huge herds of thousands as they migrate to better feeding{#blank#}7{#/blank#} (area). They often travel in{#blank#}8{#/blank#} (mix) herds with other grazers and browsers, such as wildebeest.

    Zebras groom (理毛) one another, If you see two zebras standing close{#blank#}9{#/blank#} each other and it looks like they're biting each other, don't worry. They're pulling loose hairs off each other as they groom. Grooming also feels good to a zebra—it's like having an itch scratched,

    While most zebras are least endangered, Grevy's Zebra{#blank#}10{#/blank#} (classify) as endangered.

    Sneezing(打喷嚏) is one way the body protects itself from {#blank#}1{#/blank#} (sick). Your brain {#blank#}2{#/blank#}(signal) you to sneeze. Then your eyes close and-achoo!-germs (细菌) {#blank#}3{#/blank#}(shoot) out of your nose.

    One sneeze can put as many as 40,000 droplets of saliva (唾液) and mucus (黏液) into the air. And those droplets travel up to 100 miles per hour, {#blank#}4{#/blank#}(fast) than cars on the freeway.

    Here in the US, we say "bless you" when someone sneezes. The same goes for a number of other {#blank#}5{#/blank#}(country), including Wales and France. But {#blank#}6{#/blank#} general it's more common {#blank#}7{#/blank#} (connect) to health than to give blessings. In China, you say, "May you live 100 years!" In Germany, it's simply, "Health!"

    {#blank#}8{#/blank#} do we wish sneezers well? The custom may date back to {#blank#}9{#/blank#}ancient belief. It is said that evil (邪恶的) spirits went out of our bodies during a sneeze - and that these spirits then try to get back in.

    Your nose can produce up to 32 ounces of mucus every day. That's enough mucus to fill more than two soda cans.

    Mucus is {#blank#}10{#/blank#} (usual) clear. If it's green, yellow, or brown, then you might want to see a doctor.

    As {#blank#}1{#/blank#} (teenager), you have many dreams. These dreams can be very big, such as winning the Nobel Prize, or they can be very small, for example, you may just want to become the best student in your class. Once you find a dream, what do you do with it? Do you ever try {#blank#}2{#/blank#} (make) your dream come true?

    Andrew Matthews, {#blank#}3{#/blank#} Australian writer, tells us that making our dreams come true is the biggest challenge (挑战) in our life. You may think you are not very good {#blank#}4{#/blank#} some school subjects or it is {#blank#}5{#/blank#} (possible) for you to become a writer. These kinds of thoughts stop you {#blank#}6{#/blank#} (realize) your dreams. In fact, everyone can realize his dream. Keep telling yourself {#blank#}7{#/blank#} you want. Do this step by step and your dream will come true earlier because a big dream {#blank#}8{#/blank#} (make) up of many small dreams.

    You must also never give up your dream. There will be many {#blank#}9{#/blank#} (difficult) on the road to your dreams. But the biggest one comes from {#blank#}10{#/blank#} (you).You need to decide what is the most important.

    Yesterday, I was walking down the street {#blank#}1{#/blank#} I saw four separate dimes (角) on the ground shining in the sunlight. I bent down, picked them up and entered the post office. Inside a lady {#blank#}2{#/blank#} (dig) through her purse at the counter anxiously looking for change to mail a package. Believe it or not, she was exactly forty cents short. How amazing it was! I placed my dimes on the counter. The smile I got in return was worth a thousand {#blank#}3{#/blank#} (dollar).