Write these sentences,choosing for or since putting the verb into the past simple or present perfect as necessary. 1)i (study) medicine (for/since) three years but then i stopped. 2)she (work) me (for/since) she left school. 3)i (work) in the restaurant (for/since) sox monts but then it closed. 4)l (live) here (for/since) i was a litte girl. 5)he (be) in prison now (for/since) three years. 6)i(not see) him (for/since) he left the office. 7)i (not see) her (for/since) several years and then i met her again. 8)we (be) in vienna 9)i (work) here (for/since) seven years but it's time to leave now. 10)i (live) in england (for/since) 1993