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

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Scientific progress brings us many conveniences and advanced machines, such as computers, automobiles, and so on.

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

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Simply speaking, _______ is the tools and machines that help to solve problems.

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Scientists are planning _______ Mars in the near future.

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I often eat sticky rice cake, but I don’t know _______ make it.

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Robots save workers from _______ dangerous tasks.

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You have to work _______ if you want to succeed.