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The invention of penicillin is very useful because it has _______lots of lives.

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People will take _________of robots to do household chores.

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The scientists believe that there might be some planets to .................. human life.

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Scientists believe that Mars also __________seasons just as the Earth does.

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There have been many UFO _____________reported.

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Neptune is bright blue __________it is named after the Roman God of the sea.

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The prerequisite condition for a/an .................. planet is water supplies, appropriate temperatures and breathable air.

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It is certain that robots will ___________the quality of our lives.