16. (have you known / have you been knowing / did you know) bill since last year? 17. when you (stayed / stay / will stay) in the country, you’ll enjoy the beauty of the countryside. 18. nick (has played / has been played / has been playing) football for three hours. 19. surfing (invented / was invented / was inventing) many years ago. 20. this patient (was cured / will be cured / will cured) by the end of this week. 21. nuclear weapons (mustn’t use / mustn’t be used / mustn’t be using) by people. 22. susie (looked / was looking / had looked) through the letters before her elder sister got them. 23. the continent (discovering / discovered) by cook was called australia. 24. do you know the girl (talking / talked) to tom? 25. (watering / watered) by jane, the flowers looked much fresher. 26. we didn’t expect our relatives (visit / to visit / visited) the lake district. 27. did you notice pauline (to buy / buy / bought) a present for someone? 28. the teacher made the children (clean / to clean / cleaned) the classroom. 29. bill asked if (did i visit / i had visited / had i visited) a desert in california. 30. polly told her son (to not stay / not stay / not to stay) up late. 31. mother told her children (act / to act / acted) their age. 32. ralph asked (did i notice / if i noticed / if i had noticed) a fat man sitting at the front? 33. kate said (summers were/ summers are / summers will be) very humid in moscow. 34. bill asked (where is / where was / where will be) the best place to go surfing