Complete the sentences with the correct past forms of the verb in brackets. 16. tom (read) a book while i (clean) my room. 20. owen (write) a letter when the light (go) out. 17. david (invite) carol to the party yesterday but she (already/plan) the day. 21. jason (work) in the garden for hours
before he (take) a break. 18. what (you listen) to when i (come) in? 22. three days ago liza (return) me the book i (lend) her before. 19. tina (watch) tv for three hours before the phone (ring). 23. mary (arrange) everything by the time we (arrive).