Well, if you only ask a few questions, maybe I still have your answers, but I don't have the complete answers. I believe that no matter how you look for it, there is no standard answer unless someone else helps you. This kind of exercise book is the answer as soon as it is printed. There is only one way that it is absolutely impossible to find the answer to the exercise book-you ask the person who gave these questions to give you the answer.

I hope the landlord can adopt it! thank you