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What do you think is _________ invention in the world? (useful)

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A mirror is used for _________ at yourself. (look)

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By the time I got home, I realized I _________ my umbrella in the classroom. (leave)

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She'd like to go somewhere _________. (relax)

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I used to prefer _________ alone. (walk)

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The customer thought the _________ weren't thin enough. (potato)

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Do you think who the most famous _________ is in the world? (invent)

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What's this called in English? It's a _________ disk. (fly)

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The _________ on the tree fall in autumn. (leaf)

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How many _________ can you see in the shop? (abacus)