Задайте общий, альтернативный, специальный, разделительный вопрос к подлежащему используя это предложение my mother was cooking breakfast at six o'clock yesterday

1)  was  my mother  cooking breakfast at six o'clock yesterday? 2)  was  my mother or my father  cooking breakfast at six o'clock yesterday? was  my mother   cooking breakfast at six o'clock yesterday or last sunday? 3) who   was cooking breakfast at six o'clock yesterdaywhat was  my mother  doing  at six o'clock yesterday? 4)  my mother was cooking breakfast at six o'clock yesterday, was not she?

1) who is your best friend? 2) what does she look like? 3) what do you like in your friend? 4) what are you both interested in? 5) do you quarrel sometimes? 6) what do you do together? 7) how much time do you spend together? 8) when did you meet last?  

kate's cake is tastier than ann's cake,isn't it.

cake-единственное число поэтому is.