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 Passengers __________ to smoke in the train.

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Artificial Intelligence (AI) is an area of __________concerned with making computers copying intelligent human behaviour.

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 Computers that once ___________ up entire rooms are now small enough to put on desktops and into wristwatches.

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A forest fire ________ quickly and ________ many trees.

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The tornado caused a massive ________ to the town.

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Hemp was grown throughout history ________ its versatility; it can be used to make many different things.

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Global warming ________ if there weren't too much carbon dioxide in the atmosphere.