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    Lots of scientists believe there's life on other planets．Because of this，they keep doing research about the universe．They have sent astronauts to the moon．And they have {#blank#}1{#/blank#}the answer．There's no life on the moon．Not long ago they {#blank#}2{#/blank#}spaceships to Mars．There，they didn't find life．And they found the environment of Mars was {#blank#}3{#/blank#}from that of the earth．Then they knew it was{#blank#}4{#/blank#}for people to live on Mars．

    {#blank#}5{#/blank#}they haven't received a message from other planets，they believe their idea is right．Recently they have {#blank#}6{#/blank#}a planet．It's {#blank#}7{#/blank#}Proxima Centauri．It's very {#blank#}8{#/blank#}to our earth．It is just over four light years away．Proxima Centauri is {#blank#}9{#/blank#}than the earth．And there's water on this planet．That {#blank#}10{#/blank#}mean that life is possible there．Now scientists are studying this planet．Soon they will tell people the answer．

Finally I found a chance to{#blank#}1{#/blank#} {#blank#}2{#/blank#} {#blank#}3{#/blank#}

    I'm Amy Black．I have never seen sharks in the{#blank#}1{#/blank#}．But as a(n){#blank#}2{#/blank#}，I have seen sharks in an aquarium(水族馆)．

    {#blank#}3{#/blank#}，there are between 200and 250 kinds of sharks of different sizes．Sharks are much{#blank#}4{#/blank#}than other fishes．The largest carl be as long as 15{#blank#}5{#/blank#} largest shark{#blank#}6{#/blank#}about 3，200 kilos．Usually sharks don't attack(攻击)people．Sometimes they attack people{#blank#}7{#/blank#}themselves．One of{#blank#}8{#/blank#}sharks is the Great White Shark．They attacked a lot of people on the beaches of America．

Mandy: Lisa, are you OK?

Lisa: I have a headache and I can't move my neck. What should I do? Should I take  {#blank#}1{#/blank#}temperature?

Mandy: No, it doesn't sound like you have a fever. What did you do on the  {#blank#}2{#/blank#}?

Lisa: I played computer games all the weekend.

Mandy: That's probably why. You need to take  {#blank#}3{#/blank#} away from the computer.

Lisa: Yeah, I think I  {#blank#}4{#/blank#}  in the same way for too long  {#blank#}5{#/blank#}  moving.

Mandy: I think you should lie down and rest. If your head and neck still hurt tomorrow, then go to a doctor.

Lisa: OK! Thanks, Mandy.

    The second man complained every other mile, his back pain got more and more  {#blank#}1{#/blank#}. On the Sth mile, he couldn't stand it any more and fell down on the grass. "My back is hurting me so badly. I can't go any{#blank#}2{#/blank#}because of the pain and it is al because we had to carry that silly woman across the river!" Out of{#blank#}3{#/blank#}, he asked. "why aren't you complaining about it? Doesn't your back hurt?"

    "Of course not, "the first man replied, "You have been carrying the woman since we left the river bank. But I set her down five miles ago."

    We are often like that second man who can't release complaining and pain of{#blank#}4{#/blank#}. Years later, we still carry the burdens, worn out, and can't go any further.