When people talk about the future, we like to think that we will be able to drive out of our garages and take to the skies in our own personal flying car. The advantages are obvious. Some people predict this technology {#blank#}1{#/blank#} complete freedom of movement. We could fly at 480 kilometres per hour,{#blank#}2{#/blank#}traffic lights, busy roads and speeding tickets. However, some people point to the disadvantages of flying cars. They say that there are certain to be problems with traffic control. Another big problem is engine{#blank#}3{#/blank#}. What will happen if the car goes wrong? Also, if they become popular, there is {#blank#}4{#/blank#} to be another big problem: air traffic jam. So we may find flying cars {#blank#}5{#/blank#} with more than a few problems if they are to get off the ground!

    I got a new job in Catholic University in Washington. {#blank#}1{#/blank#} a good chance, I was offered a new flat to live in. One summer vacation, {#blank#}2{#/blank#} going to the park, I had not been outside my flat, doing an experiment about a disease. The results of the experiment were {#blank#}3{#/blank#} to me and they would {#blank#}4{#/blank#} the success of my research. It is really difficult {#blank#}5{#/blank#} without enough evidence. I felt quite {#blank#}6{#/blank#}. I even doubted that the experiment would {#blank#}7{#/blank#}. Gradually, I was not {#blank#}8{#/blank#} about it. After all, too much hard work and too little rest {#blank#}9{#/blank#} illness. One night, I went out to {#blank#}10{#/blank#} a lecture by a famous philosopher. Inspired by him, I went back to continue the experiment and eventually got the {#blank#}11{#/blank#} result. How happy I was! The next day, I proudly {#blank#}12{#/blank#} that the disease was {#blank#}13{#/blank#}.

    The earth was just {#blank#}1{#/blank#} cloud of dust after the "Big Bang". The earth exploded loudly with fire and rock. {#blank#}2{#/blank#} were in time to produce many things，which were to make the earth's atmosphere. As the earth cooled down，water began to appear on{#blank#}3{#/blank#}surface. It allowed the earth to dissolve {#blank#}4{#/blank#} gases. Then life began to develop.

    Small plants multiplied and filled the first oceans and seas with oxygen. This encouraged the development of early shellfish and fish. Land animals such {#blank#}5{#/blank#}insects, reptiles and dinosaurs appeared after green plants appeared. Small clever animals spread all {#blank#}6{#/blank#} the earth. They {#blank#}7{#/blank#} putting too much carbon dioxide into the atmosphere, which prevents heat from {#blank#}8{#/blank#} from the earth into space. Whether life will continue on the earth for millions of years to come will depend {#blank#}9{#/blank#} whether this problem {#blank#}10{#/blank#} be solved.