Преобразуйте предложения из прямой речи в косвенную речь:
1) He asked, "How will he find it out?"
2) "I can show you the collection of mail stamps of my father", he added.
3) She asked, "How long have you been working at this problem?"
4) "Please, don't smoke here", said the teacher.
5) The secretary said to me: "The delegation from Moscow arrived yesterday."