Câu hỏi 11. Stamp collecting! What a wonderful hobby! I began when I was only five. I used to (11) ______ for the postman's arrival, always (12) ______ to seize unwanted envelopes and tear off the corner with the stamp stuck on it. Once – I remember it was too clearly – my mother and father were sunning themselves in the garden when the post (13) _____ on the doormat. I heard the clatter of the letter flap and hurriedly went to (14) ______. There were four or five envelops, all with very exciting stamps. Even at the (15) ______ age of five I knew one doesn't open mail addressed to other people. However, tearing just the corners off the envelops (16) ______ me as perfectly fair and allowable, and just what I did. I carefully tore as (17) ______ to the stamps as (18) _______, feeling that even the envelopes, which were addressed to my parents and not to be, should be treated with (19) _______. There were nothing furtive in what I did. I knew my parents would see what I'd done, and I didn't think there was any (20) ______ in it. They always let me tear the corners after they'd opened them.