1. Did I put live apples into the fruit bowl yesterday? What did I put into the fruit bowl? Yesterday I put live apples into the fruit bowl, didn't I? Did I put live apples into the fruit bowl or into the box yesterday?
2. Is he playing the piano now? What is he doing now? He is playing the piano now, isn't he? Is he playing the piano or a computer now?
3. Was he cooking tasty dinner yesterday? What was he cooking yesterday? He was cooking tasty dinner yesterday, wasn't he? Was he cooking tasty dinner or breakfast yesterday?
Если в третьем предложении в самом деле стоит coming, то замените слово cooking на слово coming (хотя мне это будет не понятно)