Choose the correct verb form. a) how long has dmitry been living /does he live/ in astana? b) how long has omar been styding / does he study/ at school 15 . c) my friend has been looking/looked for a bike for 3 weeks d) i wrote/ have been writing/ this exercise since 4 o clock p.m e) i am tired because i wrote/ have been writing/ this exercise since 4 o clock p.m. f) my friend is working /has been working / as an air hostees since last mouth. g) i have bought/ bought/ a dictionary a few months ago