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Artificial intelligence (AI) is an area of __________ concerned with making computers copy intelligent human behaviour.

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He said: “I like to do physics experiments.”

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“I will hand in my assignment to the teacher tomorrow.” Alan said to me.

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The teacher __________ me that I had better devote more time to doing scientific researches.

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If the teacher were here now, we’d ask him the difference __________ “science” and “technology”.

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There are a lot of benefits to do __________ researches.

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The first experiment was __________, so we need to do another one.