how time flies!There years (pass) already

how time flies!There years (pass) already How time flies!Ten years --- (pass) since I met you last tim How time flies!Three years (_) How time flies!Twenty years _____ passed. How time flies!Ten years ( ) passed How time flies!Three years _________reallt a short time. how time flies.Three years __ indeed a short time. how time flies several years --- since we started our middle How time flies!Several years ____since we started our middle how time flies How time flies!是什么意思? How time flies(fly)!