I have a very embarrassing experience this evening.       66 . ____________
I saw a man at a bus stop when I was on my way back                 67 . ___________
home. Though I saw him from behind, but I was sure he was         68 . ___________
a friend of mine whom I hadn' t seen him for a long time. I gave  69 . ___________
him a tap on the shoulders with my umbrella and shouted to        70 . ____________