The earth is the only planet with a large number of oxygen in its atmosphere.

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

• English, together with Literature and Maths, are compulsory subjects in the national curriculum.

• Doctors believe there is better in this modern world of ours to try to prevent illnesses than to rely on medicines to cure them.

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• An ambitious person is committed to improve his or her status at work.

• Although Nam worked very hard, but he didn’t pass the final exam.

• The assumption that smoking has bad effects on our health have been proved.

• Passengers are required to arrive to the gate fifteen minutes before departure time.

• Slowly and with care, the museum director removed the Ming vase from the shelf and placed it on the display pedestal.

• Students suppose to read all the questions carefully and find out the answers to them.

• Education, whether it happens at school or anywhere else, is a important part in our life.

• The company did not want to hire a man that his experiment was so limited.

• Mrs. Alien was concerned about me having to drive so far every day.

• Dislike the gorilla, the male adult chimpanzee weighs under 200 pounds.

• The Oxford English Dictionary is well known for including many different meanings of words and to give real examples.

• Instead of calling off the meeting, maybe we can just put it over until next month.

• Teddy Roosevelt demonstrated his competitive spirit and tireless energy in 1905 whenever he led the Rough Riders up San Juan Hill.

• In very early times, people around the fire were entertained by storytellers with stories of heroes’ wonderful actions and victory.

• Oxygen plays a important role in maintaining live.

• My father asked me where had I gone the night before.

• There are many different ways of comparing the culture of one nation with those of another.