Replace the infinites in brackets by the Present Indefinite, Present Continuous or Present Perfect Continuous. 1. Where

1. — Where are the pupils? — They are planting trees. They have been planting them since the morning. They always plant trees in October. They have already planted several hundred threes this year. 2. Ann is having her music lesson now. She has her music lessons twice a week. 3. I am going to take a walk. I have done all my home exercises already. I have been doing them for three hours. 4. Since when have they built this house? 5. At last I have found the book I need. I have been looking for it for a quarter of an hour. 6. Don\'t shout. Helen is reading an English book. She works at her English every day. She has been learning this language for three years. She has read many English stories this year. 7. What do you do in the morning? 8. What have you done since the morning?