You will hear part of a talk about the invention of the microwave oven. Complete the sentences with a word or short phrase.
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The invention of the microwave oven began when a chocolate peanut bar 1 in Percy Spencer's pocket. Spencer had previously invented a method for 2 the tubes used in radar equipment. Spencer's first experiment involved putting 3 near to some radar equipment. In his next experiment, an egg was put into a kettle and it 4 The first microwave oven was set up in 5 in Boston in 1946. The first microwave oven got its name as a result of 6 at the company. One problem with the first microwave oven was that 7 did not change colour in it. When a microwave oven that could be placed on top of a 8 was produced, sales began to rise.