1 my father hasn't been to hanoi for 5 years → lt's _________________________________________ 2 my father is reading a newspaper . he started 2 hours ago → my father has _________________________________ 3 lt's four years since l wrote her → l ____________________________________________ 4 l started to study english when l was 10 years old → l've _________________________________________ 5 l went over my lesson and then went to school → before ______________________________________ 6 before he watched tv , he had done all his exercises → after _______________________________________ 7 my teacher is the most generons person l've ever met → l've never __________________________________ 8 how long ís it since they bought the house ? → when ______________________________________ 9 l have never read such an interesting novel → this is _____________________________________ 10 when did you collect stamps ? → how long ___________________________________