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The_________ of penicillin is very useful because it has saved lots of lives.

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Robots save workers from ______________ dangerous tasks.

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With the advance of the science and technology, our life changes greatly in various _________.

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My brother is very good at natural_______ subjects such as Chemistry and Physics.

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The scientific method is a way to ask and answer scientific questions by making ____and doing experiments.

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While scientists study how nature works, engineers ____new things, such as Products, websites environments, and experiences.

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Terrorists are using modern technology _________ their destructive work.

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In Science, you should repeat your___ several times to make sure that the first results weren’t just an accident.