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When actively hunting, a dolphin sends out transmitting about five signals each second.

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The sum of all chemical reactions in organism’s living cells are called its metabolism.

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Thanks to this obstinacy, he achieved what he wanted. If he were discouraged earlier by him failures, he would not have reached his aims.

I cheered up my mother ___ cooking dinner for her. 

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A calorie is the quantity of heat required to rise one gallon of water and degree centigrade at one atmospheric pressure.

He became interested in_________  when he started taking pictures for the local newspaper.

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Because of it consists only of a relatively strand of DNA protected by a shell of Protein, the virus cannot eat or reproduce by itself.

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Numerous types cells, such as skin cells and white blood cells, have power reproduce asexually.

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One inventor that Thomas Edison can take credit for is a light bulb.

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The police at first knew where a bandit was hiding, but later lose track of him.

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Without alphabetical order, dictionaries would be impossibility to use.

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In spite of physician handicaps, Helen Keller graduated from Radcliffe with honors.

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The fragrant leaves of the laurel plant to sell commercially as bay leaves and are used as seasoning foods.

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Being a nurse involves being cheerful, working unsocial hours, and come home with me smelling of uninfectant.

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Please send me information wregard of insurance policies available from your company.

The floor was so rotten that it almost gave________ under his weight.

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Nomadic hunter and gatherer societies can access to only a limited amount of food in an area and moved on when they have exhausted each locality.

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The government’s budget maybe considered balanced when the amount of money it spends does not exceed the amount receives

I earn a good salary _______ working hard. 

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The world oceans have risen on average of 6 inches over past 100 years, which has been considered as an evidence global warming has an effect.

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Foreign students who are doing a decision about which school to attend may not know exactly where my choice are located.