求各位大侠 帮我做这个英语题!
Mr Black has two cats.One is big and the other（另一个） is small.He likes them very much.One day his friend Mr Green comes to see him.He is very surprised(惊奇的).He finds there are two holes() in the door,a big hole and a small one.He says,”My dear friend,why are there two holes in your door?” ”To let them in and out,”Mr Black answers.”But why are there two holes?”asks his friend.”How can the big cat go through the small hole?”he says.