The ____ was expected to be a major breakthrough for transport but in the trade-off between safety and efficiency, safety won. The outlook for its future remains poor. The ____ was expected to revolutionise communication but had a serious drawback: it could not be used over a long range and communication breakdowns were common. As glass bottles were replaced by cans, drinks manufacturers needed a replacement for the ____, and the outcome was the ____. The downside of the move to cans was a huge increase in the amount of rubbish.

inventions

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