Odpowiedź:
11. He (sleep) slept since ten o'clock. It's time he woke up.
12. Did you hear (hear) the news? Tom and Ann are engaged! - That's not new; I (know) knew it for ages!
13. I (sell) sold my old flat and then I (buy) bought my new one.
14. She has never travelled (travel) by ship.
15. His father (try) tried to find him for hours before he finally turned back home.
16. I (ask) asked my sister to do me a favour lately.
17. Did Mark water (water) the flowers the day we left?
18. I am going to New York. Tomorrow this time I (sit) will be sitting on board.
19. Mark... you make me angry!!! You (always/step) always step on my toes.!!!
20. Do you remember this girl? I (meet) met her once.
