7. They______(do) the homework on Sunday. 8. London (change) __________a lot since we first (come) __________ to live here. 9. Its very late! Hurry up or we ___________ (be) late for work. 10. He sometimes (come) __________ to see his parents. 11.Listen! Our teacher __________________ (speak). 12. When I (come) __________, she (leave) __________for Dalat ten minutes ago. 13. The traffic was very heavy. By the time I (get) __________to Mary's party, everyone already (arrive) __________ 14. I (visit) __________ my uncle's home regularly when I (be) __________ a child. 15.In the future, I think humans ___________ (wipe out) many different species. 16. In all the world, there (be) __________ only 14 mountains that (reach) __________above 8,000 meters. 17. My grandfather never (fly) __________ in an airplane, and he has no intention of ever doing so. 18.Look at that boy at the top of that tree! He ___________ (fall). 19.He is buying some butter and eggs because he _________ (make) a cake later. 20.What __________________ (you, wait) for? HELP MEEEE! THANKS YOU:(((!