The most important human inventions

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What are you up to tonight? How about going to the cinema? - Oh, I am sorry. I’m busy tonight. I need to finish my essay and _________ on the topic “The influence of social media on teenagers”.

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People shouldn’t take natural ______________ like water, gas, oil for granted. We should use them wisely.

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What are you doing here? Shouldn’t you be at home? - I’ve got no______ at home, so I am just sitting here to kill the time.

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It's a circular object connected at the centre to a bar, used for making vehicles

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Someone whose job is to invent things