No one knows exactly {#blank#}1{#/blank#}the earth began. According to a widely accepted theory, the earth began with a “Big Bang”,{#blank#}2{#/blank#}exploded loudly and produced water vapor and many gases，{#blank#}3{#/blank#} (make) the earth's atmosphere. As the earth cooled down, water appeared and stayed{#blank#}4{#/blank#} the surface. It was the presence of water{#blank#}5{#/blank#}allowed the earth to dissolve harmful gases and acids into the oceans and seas, which made {#blank#}6{#/blank#}possible for life to develop. First, the appearance of small plants encouraged the development of early shellfish and all sorts of fish. Next, green plants began to grow on land. {#blank#}7{#/blank#}were followed by land animals. So reptiles appeared for the first time. Later, dinosaurs developed.{#blank#}8{#/blank#}they suddenly disappeared. After that, mammals came into being. Finally, humans appeared and spread all over the earth. However, they are putting too much carbon dioxide into the atmosphere, making the earth too hot{#blank#}9{#/blank#}(live) on. So whether life will continue on the earth will depend on {#blank#}10{#/blank#}this problem can be solved.

    I enjoy{#blank#}1{#/blank#} (climb) mountains whenever I can find the time to do so. Tom and Mike are my best friends. Both of {#blank#}2{#/blank#} also like sports. Two years ago, the three of us {#blank#}3{#/blank#} (go) up to Mt. Lushan. Instead of taking a bus, which would be {#blank#}4{#/blank#} (comfortable), we preferred to climb. We started {#blank#}5{#/blank#} the foot of the mountain early in the morning, chatting all the way. After about one and a half hours' climbing, we saw two mountain {#blank#}6{#/blank#} (path) before us. We could not decide {#blank#}7{#/blank#} to choose. In the end, we took the path on the right, thinking that might be a short cut. But we were wrong. {#blank#}8{#/blank#} (lose) in the mountain, we could not find our way out. We had to use our hands and feet to make a way. We began to cry for help {#blank#}9{#/blank#} nobody answered. It was not until darkness {#blank#}10{#/blank#} (fall) that we found a right path leading up to a paved road.

    Switzerland is famous{#blank#}1{#/blank#}its watches. However, this country didn't invent the watch. It was the British who did it. Here is a story of how the watch{#blank#}2{#/blank#} (bring) to Switzerland.

    Many years ago,{#blank#}3{#/blank#} Englishman traveled to Italy and on his way he stopped in a small town{#blank#}4{#/blank#}(call) Geneva in Switzerland. This Englishman traveled in a carriage(马车) inside which there was a carriage watch. This was the{#blank#}5{#/blank#}(early) kind of watch. A native shop assistant(售货员) happened to see the watch. He wondered what it was{#blank#}6{#/blank#}asked the Englishman about it. “It is a carriage watch.” answered the man. “This machine can tell the time but now {#blank#}7{#/blank#} isn't working.” At once the shop assistant offered to try repairing it. So the {#blank#}8{#/blank#} (travel) handed him the watch. The man was very clever. It was easy for him {#blank#}9{#/blank#} (repair) it. He even remembered{#blank#}10{#/blank#} it was made. And he made a watch of exactly the same type.

A Bite of China

    No trip would be complete without experiencing the local food culture. Actually, China has various kinds of delicious food,{#blank#}1{#/blank#} (include) a wide variety of local snacks (小吃).

    Without a doubt, for the majority of the foreigners I contacted, and myself included, Peking Duck, Dim Sum, Mongolian Hot Pot were the favorite Chinese{#blank#}2{#/blank#}(dish). China is a place{#blank#}3{#/blank#}the food is not only delicious, but the{#blank#}4{#/blank#}(cheap) I've ever found.

{#blank#}5{#/blank#}my last night in Beijing before returning to the States, I went to a Peking Duck restaurant that had been suggested for me to try. What a beautiful place! Splendid woodblock prints on the walls, fresh flowers in the vases on the table,{#blank#}6{#/blank#} (attract) silverware (镀银餐具) and beautiful chopsticks. I was handed{#blank#}7{#/blank#}menu and found most of the prices{#blank#}8{#/blank#}(be) especially low for the high quality of the food. The duck came in whole or half, along with all the little decorations that you know if you've ever eaten Peking duck—a little tortilla (玉米饼) to put the sliced duck and vegetables in chopped onion, sauce.

    Anyway, I ended up ordering a whole duck and thought I'd just take the rest back to my hotel{#blank#}9{#/blank#}(eat) later if I couldn't finish it. Unbelievably, in the end there was none of the whole duck{#blank#}10{#/blank#}(leave) on the plate. Umm, yummy!

    People with colour blindness can't see colours in a normal way. Colour blindness{#blank#}1{#/blank#}(affect) approximately 1 in 12 men and 1 in 200 women in the world.

There are various causes of colour blindness. For the majority of colour-blind people, the condition is something they have from {#blank#}2{#/blank#}(bear), although some people get it later in life because of diseases.

    Most colour-blind people can see things as clearly as other people, but {#blank#}3{#/blank#} are unable to fully "see" red, green or blue light. There are different types of colour blindness and there are extremely rare cases {#blank#}4{#/blank#} people are unable to see any colour at all. The {#blank#}5{#/blank#}(common) form of colour blindness is red/green colour blindness. Although {#blank#}6{#/blank#} (know) as red/green colour blindness, the form of colour blindness doesn't mean sufferers {#blank#}7{#/blank#} (mere) mix up red and green. It means they mix up all {#blank#}8{#/blank#} (colour) that have some red or green as part of the whole colour.

    The effects{#blank#}9{#/blank#}colour blindness can be mild, moderate (中等的) or severe. Approximately 40% of colour blind people are even unaware that they're colour blind. Statistically{#blank#}10{#/blank#}(speak), most people with a moderate form of red/green colour blindness can only identify 5 coloured pencils from a standard box of 24 pencil crayons.

    John Snow was a famous doctor in London, who was so expert that he attended Queen Victoria as her {#blank#}1{#/blank#}(person) physician. But he felt {#blank#}2{#/blank#}(inspire) when he thought about {#blank#}3{#/blank#}(help) people exposed to cholera. Cholera was a {#blank#}4{#/blank#} (dead) disease and neither its cause nor its cure was understood. John Snow wanted to face the challenge and solve the problem. He suspected that people absorbed this disease {#blank#}5{#/blank#} their bodies with their meals. So when another outbreak hit London, he began his enquiry. He found that many victims {#blank#}6{#/blank#}(link) to the outbreak were near the water pump, so he had the handle {#blank#}7{#/blank#} (remove). Soon afterwards the disease slowed down. He drew a conclusion that the water was {#blank#}8{#/blank#}(blame).

    The water {#blank#}9{#/blank#}(company) were instructed not to expose people to {#blank#}10{#/blank#}(pollute) water any more. Finally "King Cholera" was defeated.