21. I often (leave) 22. The guests (watch) 23. I (see) 24. The sun (set) 25. My friend (study) 26. Listen. I (hear) 27. I (do) (know) you the city at weekends. the TV 28. Honesty (be) 29. The earth (go) 30. Two and two (make) (wear) in the west. programmes now. English for an hour every night. someone knocking at the front door. an exercise on the present tense at the moment and I (think) how to use it now. your best clothes. the best policy. round the sun. four. that I Trang 32