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In Science, a theory is a reasonable explanation of observed events that are related. A theory often involves an imaginary model that helps scientists picture the way an observed event could be produced. A good example of this is found in the kinetic molecular theory, in which gases are pictured as being made up of many small particles that are in constant motion.

A useful theory, in addition to explaining past observation, helps to predict events that have not as yet been observed. After a theory has been publicized, scientists design experiments to test the theory. If observations confirm the scientists' predictions, the theory is supported. If observations do not confirm the predictions, the scientists must search further. There may be a fault in the experiment, or the theory may have to be revised or rejected.

Science involves imagination and creative thinking as well as collecting information and performing experiments. Facts by themselves are not science. As the mathematician Jules Henri Poincare said: "Science is built with facts just as a house is built with bricks, but a collection of facts cannot be called science any more than a pile of bricks can be called a house."

Most scientists start an investigation by finding out what other scientists have learned about a particular problem. After known facts have been gathered, the scientist comes to the part of the investigation that requires considerable imagination. Possible solutions to the problem are formulated. These possible solutions are called hypotheses. In a way, any hyphthesis is a leap into the unknown.It extends the scientist's thinking beyond the known facts. The scientist plans experiments, performs calculations, and makes observations to test hypotheses. For without hypotheses, further investigation lacks purpose and direction. When hypotheses are confirmed, they are incorporated into theories.Which of the following is the main subject of the passage?

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It can be an amazing experience for those who have the x to leave their family and friend and live in a new place

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x TV for the last four hours? Turn it off and get some exercise

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Make sure you x your assignment before you go to bed

A lot needs be done to the house before anyone can start living in

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It took Ted a long time to get x the breakup of his marriage

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Mr. Simkins is the big x in the company as he has just been promoted to the position of Managing Director

It is of great importance that he speaks to the Dean before leaving for his location

There are very large rooms with beautiful decorated walls in her new house

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Some crimes seem to be x in this country than in others

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Of course an encyclopedia is not a book you read x

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The Red Cross all over the world has carried out a lot of x

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“You haven’t been to the bank today, have you?” - “ x .”

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“What was Derek’ s reaction to the accusation?”

“Well, he denied x anywhere near the house at the time.”

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Mary invited her friend, Sarah, to have dinner out that night and Sarah accepted.Mary: “Shall we eat out tonight ?” - Sarah: “ x .”

Your trip to DaLat sounds absolutely fascianted. I'd love to go there