Раскройте скобки, поставив глагол в Present Perfect или в Past Simple. 1.Unfortunately people (not/have) mobile phones in the 1960s. 2.This is the most difficult (I/ever/do) 3.(it/stop) raining yet? 4.She (become)a vegetarian a few years ago. 5.He (not/play) volleyball since he was a student 6.When (you/start)doing sport seriously?