U55 Accidental inventions

Choose the correct answer.

The microwave oven _____ by accident when it was noticed that a chocolate bar melted near a radar device.

• had invented

• was invented

• invented

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The idea for penicillin _____ when it was noticed that mold killed bacteria in petri dishes.

• were discovered

• was proved

• was discovered

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Post-it Notes _____ when a weak adhesive was unexpectedly found instead of a strong one.

• designed

• was designed

• were designed

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The invention of Coca-Cola _____ by accident when different ingredients were mixed, creating a new drink.

• was proved

• was an improvement

• was created

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The use of anesthesia _____ after it was noticed that certain gases made people feel no pain.

• was introduced

• was proved

• was designed

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The invention of matches _____ when a chemical substance stuck to a stick and ignited by chance.

• was created

• was proved

• was designed

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Potato chips _____ when a chef tried to annoy a customer by making fried potatoes too thin and crispy.

• was introduced

• were created

• was developed

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The first colored M&Ms _____ when candy makers experimented with a new way to coat chocolate.

• were developed

• was created

• was introduced

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Chocolate chip cookies _____ when a baker added chocolate pieces, expecting them to melt completely.

• was designed

• were created

• was proved

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The toaster _____ when a device was created to heat bread evenly using electric coils

• was introduced

• was developed

• was created