Exer 1 : Chia động từ trong ngoặc ở thì hiện tại hoàn thành hoặc thì hiện tại hoàn thành tiếp diễn 1. How often ______ (you clean) the windows this year? 2. I ______ (work) all day and (just come) home from the office. 3. The girls _______ (be) at school since 7 o’clock. 4. We _____ (play) basketball for the last few hours. (play) 5. I _____ (wait) for the train for half an hour, but it still _____ (not arrive) yet. 6. She ______ (not cook) anything yet because she _____ (talk) to her neighbour all the time. 7. She _____ (work) for the company since she graduated from university. 8. They _____ (live) in Boston since they arrived in the USA ten years ago. (live) 9. Ben, where have you been? I ______ (wait) for you since 2 o’clock. 10. My wife is exhausted because she _____ (work) too hard all day. (work) 11. It ______ (rain) all week. I hope it will stop by Saturday. 12. She ______ (perform) in eight movies since she began acting. 13. Jane _____ (work) on the computer for hours, and she (not finish) yet. 14. The department store is still closed. It ____ (not open) yet. 15. How many times ____ (you take) this exam?