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

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Some of plants in a store require very little care, but this one needs much more sunlight than those 

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He is truly a reliable friend. He will always be with me and never let me down.

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Someone who has ever tried to pick up spilled Mercury will agree that this element is hard to handle

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It is their nice crystal structure that gives diamonds their hardness, brilliance, and transparent.

They argued___________ us_________ the problem last night, but we could not find _______ the solution.

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

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The president’s compassion for the refugees caused him to admit a very large number of them.

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You should give up ____ your sister.

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She finds the work she has to do quite easily; boredom is her biggest problem.

Strict______ measures are in force in the capital to protect it from terrorism.

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Some conifers, that are tree that have cones, are able to thrive on poor, thin soil.

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Early balloonists remained aloft in the air for relatively short periods.

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I believe the government will use advanced technology to build faster trains and make people's life more comfortable.

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The leader emphasized the need for justice and equality between his people.

With recent developments in solar car design and the measurement of photovoltaic cells becoming smaller, the dream of a truly efficient solar car is more _________ than fantasy.

-Peter. “Can I get you something to drink?”

-Sarah. “_________”

A nuclear station may take risk going off due to unexpected incidents.

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

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It's a nice day. Does anyone fancy ____ for a walk?

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The situation seemed hopeless and desperation filled them both with anger.