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BronzeV, after heated by a strong flame, will change color, especially when expose to hydrogen.

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About 200 million years before, continents were part one vast land mass called Pangaea.

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The student realized with disappointment that he had learned new nothing in that lecture.

Choose the best answer to complete each unfinished sentence, substitutes the underlined part.

Friends advised her to stop (A) doing (B ) the housework (C) because (D) her old age.

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In the field of acting theory, controversy arises over the question of whether is acting as a behavioral or the mental process.

The booklet is printed in big letters ______even the old and young to read with unaided eyes

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Because fly is a parasite of harmful insects, much species have been imported into the United States to combat insect pests.

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Most of the magnesium used in United States comes from the sea water.

As soon as they arrived at the hotel they took the elevator their room and straight to bed because they were so tired.

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Do think that humans will ever be able to live other planets?

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The early periods of aviation in the United States was marked by exhibition flights made by individual fliers or by teams of performers  in a lot country fairs.

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Even the most discriminating gourmet will agree that food in the south is as good as any different regions in the country.

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Air pollution, together with littering, are causing many problems in us large, industrial cities today.

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Bacteria are responsible of a lot of the textures and flavors in food and are particular important in milk products.

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Depth cratered, moon is over 2100 miles in diameter with negligible gravity and atmosphere.

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Ur Consumers have formed co-operatives to provide themselves with necessities such groceries, Household appliances, and gasoline at lower cost

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Today successful farmers are experts not only in agriculture, but also in market , finance, otherwise  accounting.

The ball rolled ______ the lawn. 

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Ancient people made the clay pottery because they needed it for their survival.

Choose the correct answer to complete the sentence. "I am expecting ______ my best friend"

If I had gone to the party last night, I _________tired now.