17.complete the fallowing sentences using since or for as required. 1. i haven''t seen a)christmas; b)three days. 2.she hasn"t spoken to a) an hour and a half; b) january. 3. we"ve been a) more than two years; b) last week. 4. i haven"t had time to do a) i was ill; b) last monday. 5. we haven"t bought any new a) a week; b) ages; c) then. 6. i have become a vegetarian.i haven"t eaten any a) over a year; b) i was a boy. 7. nobody has written to a) many weeks; b) my bithday. 8. you"ve asked the same question every a) the beginning of the year; b) the last fortnight