The following discussion(讨论) took place(发生)　 between a father and his nine-year-old son．

The following discussion(讨论) took place(发生)　 between a father and his nine-year-old son．
“It's unfair(不公平),Dad．Mum wants me to make my bed,but I don't know how．”
　　“It's time for you to learn．Where are your clean sheets(床单)?”
　　“I don't know．”
　　“What do you mean you don't know?You need to take care of your things．”
　　“Where are Jack's sheets?”the father called to his wife．
　　“Right next to ours,”the wife answered．
　　After a moment,the father asked slowly,“Where ale ours?”
　　36．The discussion takes place between ________．
　　A．a husband and a wife　　　　　 B．a mother and her son
　　C．a father and his son　　　　　　D．a mother and a father
　　37．The son doesn’t know _____．
　　A．how to wash his sheets　　　　 B．how to make his bed
　　C．how to clean his sheet　　　　　D．how to clean his bed
　　38．The father doesn't know _____．
　　A．how to wash sheets　　　　　　 B．how to make his bed
　　C．how to clean sheets　　　　　　D．where his sheets are
　　39．The father says his son is _____ because he doesn't know where his _____ is．
　　A．careful,sheet　　　　　　　　 B．careless,bed
　　C．careful,bed　　　　　　　　　 D．careless,sheet
　　40．Who do you think take care of the housework(家务) in the family?
　　A．the father　　　　　　　　　　 B．the mother
　　C．the child　　　　　　　　　　　 D．No one