[2016·ÔæÇ¿ÖÐѧģÄâ]William taught at Boston University. He once __1__ a great number of unthanked people in his life. These were people who had helped him, inspired him or who cared enough about him to leave a(n) __2__impression. One of them was a teacher he'd not heard of in many years. But William __3__ she had written a short poem for him, and he had thus loved poetry all his life. He found her __4__ and sent her a letter of thanks. The reply he received __5__ with “ My dear Willie”. He was very __6__. Now over fifty, he didn't think there was a person left in the world who would call him “Willie”. Here is that __7__.