Помогите, пожалуйста, с английским! Open the brackets. Use Present Perfect or Present...

Помогите, пожалуйста, с английским!
Open the brackets. Use Present Perfect or Present Perfect Continuous.
1.He is running now. He (to run) for ten minutes without any rest.
2.Where is he? — He is in the garden. He is playing volley-ball with his friends. They (to play) since breakfast time.
3.I to live in St. Petersburg. I (to live) in St. Petersburg since 1990.
4.She already (to do) her homework for two hours; but she (not yet to do) half of it.
5.I (to wait) for you since two o'clock.
6.What are you doing? — I am reading. I (to read) for already two hours. I already (to read) sixty pages.
7.This man is a writer. He writes books. He (to write) books since he was a young man. He already (to write) eight books.
8.What you (to do) here since morning?
9. Lena is a very good girl. She always helps her mother about the house. Today she (to help) her mother since morning. They already (to wash) the floor and (to dust) the furniture. Now they are cooking dinner together.
10.This is the factory where my father works. He (to work) here for fifteen years.
11.You (to find) your note-book? — No! I am still looking for it. I already (to look) for it for two hours, but (not yet to find) it.
12.You (to play) with a ball for already three hours. Go home and do your homework.
13.I (to wait) for a letter from my cousin for a month already, but (not yet to receive) it.
14. It is difficult for me to speak about this opera as I (not to hear) it.
15. I just (to receive) a letter from my granny, but I (not yet to receive) any letters from my parents.