16 John ____________________ (live) in Denver since 2017. 17. You ever ______________ (climb) Mount Everest? - No, I haven't. But I’m sure I will, if I have a chance. 18. It is nice to see you again. We ____________________ (not see) each other for a long time. 19. I ____________________ (forget) my key. I can’t unlock the door now. 20. Eric is calling his girlfriend again. That is the third time he _____________ (call) her this evening. 21. Last year, my father ________________ (promise) to buy my sister a piano. She ________________ (be) very delighted to hear this. 22. It _______________________ (be) very hot last summer. 23. I _______________________ (walk) home after the party last night. 24. The Chinese _______________________ (invent) printing. 25. Sam and I _____________________ (play) tennis yesterday. He was much better than I was, so he 26. I saw you in the park yesterday. You _______________ (sit) on the grass and _____________ (read) a book. 27. When I came home, my mother _______________________ (prepare) the meal. 28. Jane _______________________ (wait) for me when I arrived. 29. Yesterday evening, while my mother _______________________ (cook) in the kitchen, my father _______________________ (watch) the news on TV. 30. Just as I _______________________ (leave) the house, I heard an explosion from the inside the lab