[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"exercise-C1-422":3},{"preview":4,"open":35,"missing":36},{"id":5,"number":6,"total":7,"level":8,"course":9,"activity":10,"discriminator":11,"title":12,"slug":13,"instructions":14,"excerpt":15,"prompts":16,"lock":17,"access":18,"updated":19,"previous_id":20,"next_id":21,"previous":22,"next":26,"first":30},422,26,60,"C1","listening","gapped_text","listening_gapped_text","The invention of the Microwave","the-invention-of-the-microwave","You will hear part of a talk about the invention of the microwave oven. Complete the sentences with a word or short phrase.","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…",[],"login","pro","2026-10-02T14:14:49",421,423,{"id":20,"number":23,"title":24,"slug":25},25,"Driving a taxi","driving-a-taxi",{"id":21,"number":27,"title":28,"slug":29},27,"Features of best-selling books","features-of-best-selling-books",{"id":31,"number":32,"title":33,"slug":34},397,1,"Making wine at a small vineyard","making-wine-at-a-small-vineyard",null,false]