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During the last 400 years, most scientists have  ________on mathematics in their development of their inventions or discoveries.

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Commercially the honey is heated and filtered in order to stabilize and clarity it

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In spite modern medic technology, many diseases caused by viruses are still not curable

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All root vegetables grow underground, and not all vegetables that can grow underground are roots.

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Lewis and Clark had been gone for such long along their expedition that many thought they were dead

It was midnight. Outside it ........................... very hard.

I had a glance at the article, but I haven't read it yet.

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So far I ____ any of the exams at school.

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The Dave Brubek Quartet of the most popular jazz bands of the 1950s, had particularly loyal following on campuses college.

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Wealthy people have always desired and wear precious stones because their beauty is lasting

Protecting Florida’s coral reefs is difficult because some of corals are very fragile even the touch of a diver’s hand can kill it.

Peter was asked to _________ to a newspaper article making predictions for technological progress In 10 years.

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There are (many different ways of comparing  the economy of one nation with those of another

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Last night, when I was reading, I heard the door to open and saw the shadow move across the floor.

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While searching for the wreckage of a unidentified aircraft, the Coast Guard encountered severe squalls at sea.

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The invention called Silicon chip in the 1960s has revolutionized the  computer industry

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A 1971 U.S government policy not only have warnings on cigarette packs but also ban television advertising of cigarettes

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We didn’t have many knowledge about physics.

Up to now, ________ space exploring still remains ________ very risky, complex, and expensive endeavor.

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A factor in the formation of desert are high mountains, which shield the region, from rainfall 

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