Earthquake are common: thousands of them happen each day. But most are too weak to feel. During a 1 earthquake, there is often a great noise first. Then the earth 2 terribly and many houses fall down. Railway tracks break and trains go 3 lines; a great many factories are destroyed; thousands of deaths are caused, and many more lose homes. Besides the great damage and deaths caused by the earthquake 4, other accidents such as fires often 5.

    More buildings are destroyed and more deaths caused.

    It is well-known of the dangers of an earthquake, 6 for centuries man has been making researches on earthquakes. More than 2000 years ago, 7, a Chinese scientist named Zhang Heng invented a machine which could 8 from which direction the seismic waves（地震波）had come, and this machine is still used by scientists today. Now we know much more about earthquake and    9 they happen, but we still can't  10 exactly when and where an earthquake will happen, and can't stop it from happening.

The US public uses about 50 billion water bottles a year and most of those {#blank#}1{#/blank#} bottles are not recycled, according to Elizabeth Royte's book Bottlemanid: How Water Went on Sale and Why We Bought It.

More than $100 billion is spent every year on bottled water in the U.S. in many developing countries where there isn't a safe {#blank#}2{#/blank#} of tap water, bottled water is the only choice.

In the US, tap water is controlled by the government and often {#blank#}3{#/blank#} for dangerous substances(物质). Each American drinks 79 litres of bottled water per year {#blank#}4{#/blank#}. The bottled water industry is so successful that it has outpaced milk, coffee, and juice in the number of gallons of drinks sold – putting it behind only beer and soda.

    We cannot stop earthquakes, but we can do things to make sure they do not destroy (破坏) whole cities. First, it is not a 1 idea to build houses along the lines where2of the earth's plates join together. Second, if you think there 3 be an earthquake, it is better to build houses on rock, not on 4. Third, you must make the houses as 5 as possible. Weak buildings will fall down in an earthquake, but strong ones may 6.

    Scientists are 7 that one day an even bigger earthquake will hit the part around S an Francisco. They call it “The Big One”. But people today are still building more 8. The population in and around San Francisco 9 is ten times more than it was in 1906. This means that 10 there is another earthquake, a great many houses and buildings will be destroyed.

    Australia is one of the largest countries in the world. It is 1 smaller than China. It is in the south of the earth. Australia is big, but its population is 2. The population of Australia is nearly as large as that of Shanghai.

    Enough laws have been 3 to fight against pollution. The cities in Australia have got little air or water pollution. The sky is blue and the water is 4. You can clearly see fish swimming in the rivers. Plants5very well.

    Last month we visited Perth, the biggest city 6 Western Australia, and went to a wild flowers' exhibition(展览 ). There we saw 7 large number of wild flowers we had never seen 8. We had a wonderful time. Perth is9 for its beautiful wild flowers. In spring, every year Perth has the wild flowers' exhibition.10visiting Perth, we 11 a day in the countryside. We sat down and had a rest near a path at the foot of a hill. It was quiet and we enjoyed ourselves. Suddenly we heard bells ringing at the top of the hill. What we saw made us 12all our things and run back to the car as quickly as we could. There were about three hundred sheep 13towards us down the path.

    Australia is well-known for its sheep and kangaroos. After a short drive from 14 town, you will find yourself in the 15of white sheep. Sheep, sheep, everywhere are sheep.

    For the first time. scientist have made clones(克隆) of monkeys. A clone is a copy of a living thing. A team of Chinese 1used cloning to make two baby monkeys. Both are girls. They are named ZhongZhong and Huahua.

    Scientist have cloned other kinds of 2. They have cloned dogs and cats, they have also cloned pigs, cows and ponies. The 3animals to be cloned in the world was a sheep named Dolly. She 4in 1966.

    Scientist had never been able to clone primates (灵长类动物), Primates are a group of animals. They include monkeys. apes (猿) and people. Now, that has come true. Soon scientist may be able to clone 5 too. However, the Chinese scientist will not be cloning people, they will keep cloning monkeys6monkeys are more like people than other lab animals such as mice or rats. Lab animals can help to study diseases. Cloning monkeys is 7to the scientist for medical studies.

    However, there are still reasons that some scientists want to8people. For example, some parents might want to clone a child who has died. Yet the cloned Child would 9really be the same. They would look like the same, but would not be the same one. It might be hard for them to know that they were a clone of10else.

    Global warming means the temperature of the Earth is getting higher and higher. If the Earth gets 1, some of the following things could happen:

    The sea level could 2 because of the melting of sea ice.

    Many animals that live on the ice might 3 out.

    There could be more floods(洪水), 4 near the sea and rivers.

    Some plants and animals might die because they cannot live in high 5.

    Global warming is a very 6 problem now. There is something we can do to help to slow it down.

    Scientists have been studying global warming for years. They have found that some things that people do in everyday life make much gas that 7 global warming. One big cause of this is the burning of oil, gas and coal for energy for our cars and homes. This gives off too much greenhouse gas. We can do something to cut 8 on the amount of greenhouse gas.

    ⒈ We can really help by using less energy in life, and less gas in our family cars. We should turn off the 9 and turn down other electrical equipment. We should walk more and use cars less.

    ⒉ 10 can take in some of the greenhouse gas. So we should plant more trees.