For __________ , when your body encounters something like pet dander, it should realize it’s harmless.

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Our civilization is so commonplace to us that rarely we stop to think about its complexity 

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Polio, one of a group of spinal inflammations, causes paralysis often resulting in disabled and deformity.

She ____to me since last year.

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P.T. Barnum opened his own circus in 1871 and become one of a most famous showman of his time.

With only two days of____________negotiating time left, hope of progress was quickly evaporating at the climate talks.

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They are known that colds can be avoided (by eating the right kind of food taking exercise regularly

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More than 10,000 years ago, glaciers moved across the Minnesota region four time, leveling most of the whole land

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At the Hermitage, Andrew Jackson’s home Tennessee, even his glasses have been left exactly where he lay them.

She has a promising future ahead ________ her.

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

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Salmon lay eggs and die in fresh water, although they live in salt water when (most of their adult lives

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Jaguarundis are sleek, long-tailed creatures colored either an uniform reddish brown or dark grey.

He rose from his chair and___________her warmly.

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Despite of rain or snow, there are always more than fifty thousand fans at the OSU football games.

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A film isn’t worth to watch, whatever the subject, unless it engages the viewer’s mind and makes him think.

They can __________certain foods, pollen, or pet dander.

____ dating involves couples going out together. It gives you the chance to see how your date interacts with other people.

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The film we saw last night was different from that I had expected

He has a very outgoing ________ and makes friends very easily.

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Upon reaching the destination, a number of personnel is expected to change reservations and proceed to Hawaii.