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

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Do you know _______ language is spoken in Kenya?

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- _______ do you play tennis?

- For exercise.

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These days, modern computers are often light in _______.

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

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The teacher asked me to speak _______.

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_______ bags are you carrying? – Judy’s.

Choose the word that has the same meaning as the underlined word.

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