How will our continuously growing population affect our way of life, our environment, even our planet? No matter how you look at it, we will face {#blank#}1{#/blank#}extremely serious problem. By the middle of the 21^st century, we {#blank#}2{#/blank#}(use) up all the oil that drives our cars if at the rate we're going. Even if scientists develop some new {#blank#}3{#/blank#}(way)of feeding the human race, the crowded conditions on the earth will make {#blank#}4{#/blank#}necessary for us to look for open space somewhere else. But none of the planets in our solar system are able  {#blank#}5{#/blank#}(support) life at present. One possible solution {#blank#}6{#/blank#}the problem, however, has recently been suggested by an American scientist, Professor Carl Sagan. His idea is {#blank#}7{#/blank#}before the earth's resources are almost exhausted, it will be  {#blank#}8{#/blank#}(total)possible to change the atmosphere of Venus（金星）and so create a new world almost as large as earth itself.

    However, {#blank#}9{#/blank#} his idea is turned into reality, humans have a long way to go. On the one hand, Venus is much {#blank#}10{#/blank#}(hot)than the earth; on the other hand, there is only a tiny amount of water there.

    Friendship is very{#blank#}1{#/blank#}(importance). Everyone{#blank#}2{#/blank#}(need) friendship. In all our lives we can't live without friendship just as we can't live without air {#blank#}3{#/blank#} water. Friendship makes us get on well {#blank#}4{#/blank#}one another to go ahead under different{#blank#}5{#/blank#}(kind) of difficulties in front of us. But{#blank#}6{#/blank#}(really) friendship is not easy to come by. True friendship must be sincere and be based on{#blank#}7{#/blank#}(understand) each other but not on benefits of each other. A good friend can always be a good teacher to {#blank#}8{#/blank#}(we).By his advice we are persuaded{#blank#}9{#/blank#}( go )the right way. Therefore{#blank#}10{#/blank#}  more friends we have, the better we can improve ourselves.

    Mac was cycling along a road. With a heavy camp bag, he wasn't moving very fast. Suddenly he heard loud breathing behind him. {#blank#}1{#/blank#} (look) to his side, he was {#blank#}2{#/blank#} (terrify) to find it wasn't a dog but a wolf that was running after him. He reached {#blank#}3{#/blank#} the spray in the bag. With one hand on the handlebar, he fired it. A bright red color covered the wolf and it fell back shaking its head. But a minute {#blank#}4{#/blank#}(late) it was by his side again. He sprayed {#blank#}5{#/blank#} second time, the wolf falling back again but only to quickly restart {#blank#}6{#/blank#} (it) attack. The wolf was getting closer. Mac waved and yelled at passing {#blank#}7{#/blank#}(motorist) but meanwhile rode hard. He knew clearly he must be careful not to slow down. {#blank#}8{#/blank#}(fortunate) , Paul and Becky were driving along the same road when they spotted the scene. They drove toward Mac. When the car was in front of him, Mac jumped off the bike and dashed for the back door. Paul {#blank#}9{#/blank#}(open) the door so as to let Mac in. It was quite a while {#blank#}10{#/blank#} Mac became calm and thanked them.

    When someone has{#blank#}1{#/blank#}(deep)hurt you, it can be very difficult to let go of your anger. But forgiveness is possible and it can be surprisingly {#blank#}2{#/blank#}(benefit) to your physical and mental health. So far, studies {#blank#}3{#/blank#}(show)that people who forgive can have more energy, better appetite and better sleep. "People who forgive show {#blank#}4{#/blank#}(little)anger and more hopefulness, "says Dr Frederic Luskin, who wrote the book Forgive for Good. "So it can help reduce the tiredness out of the immune system and allow people {#blank#}5{#/blank#}(feel) more energetic. "

    So when someone has hurt you, cool down first. Take a couple of breaths and think of something {#blank#}6{#/blank#}gives you pleasure: a beautiful scene in nature, or someone you love. Don't wait for an {#blank#}7{#/blank#}(apologize). "Many times the person who hurt you may never think of apologizing," says Dr Luskin. "They may have wanted to hurt you or they just don't see things in the same way. So if you wait for people to say sorry, you could be waiting for a very long time."

    Next keep {#blank#}8{#/blank#}mind that forgiveness does not necessarily mean {#blank#}9{#/blank#}(accept) the action of the person who {#blank#}10{#/blank#}(upset) you. Instead, learn to look for the love, beauty and kindness around you. Finally, try to see things from the other person's perspective. You may realize that he or she was acting out of ignorance. To gain perspective, you may want to write a letter to yourself from that person's point of view.