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In  many areas of  world, people need clothing for protection the weather.

Generally speaking, a magnitude 1.0 earthquake on the Richter scale is detected by instruments but not as person.

When Keith visited Alaska, he lived in a igloo in the in the winter months as well as the spring

So  when Whitman returned to the Pacific , overs thousand settlers went with him.

Alike other forms of energy, natural gas may be used heat homes, cook food, and even run automobiles.

With above 20,000 species, the world’s population ants has continued to increase even as other animal populations have declined.

If airplane ticket wasn’t expensive, I could fly to Singapore for my holidays.

You’ll find that this tool is very useful ________ many different things. 

Those of us who (have a family history of heart disease should make year appointments with their doctors

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Do you think what people have smoked less and less?

Some foods … him ill.

I didn’t expect to win the match. I was quite surprised ________ the result. 

When a pearl is cut in half and examined under microscope, but its layers can be seen

I was such nervous that I didn’t think would pass the exam.

Either Mr. Anderson or Ms Wiggins are going to teach our class today.

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The Earth was flat, was believed by most people in the fifteenth century.

Many of the important products obtained from trees, one of most important is wood pulp, which is used as paper-making 

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Nowhere he could find good place to study, so he returned to his dorm

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He was so careless that he left work half doing and went to the cinema

In safari parks, which wild animals roam freely, visitors are forbidden get out of their cars.

Compact discs, which appeared on the market in the early 1980s, produce sound better quality than those of Standard phonograph records