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15. You __________________ (not stop) talking since you got here!

16. How often            _____________ (they/ go) jogging?

17. I (talk) ……………… to my father at the moment.

18They ______________ (work) in this company since 2001.
19. _________ you __________ (see) Joana recently?

20. _____________ (your parents/ watch) TV every night?

21. Children often _____________ (use) a computer for school work.