I .................. (cook). 17. They ................ (redecorate) the house when I .................. (visit) them. 18. While I .................. (go) to work, someone .................. (steal) my purse

I am cooking (Present Continuous).

17. They have been redecorating the house when I visit them (Present Perfect Continuous и Present Simple).

18. While I was going to work, someone stole my purse (Past Continuous и Past Simple).