Fill in each blank with a word according to the information given. Once in a while I was teaching English at a college in Boston, a foreign student came to class and was happy with the first snow he has ever seen. Very excited, he shyly said to me, 'I am writing a poem (诗) about the snow.' The next day, after more snow had fallen, he said he had bought boots but was having 'much trouble with slipping (滑) and falling.' After another heavy snow, I met my foreign student on the playground with deep snow. 'How are you?' 'I have thrown away my poem.' 1. Once in a while the writer was teaching _______ at a college in ________. 2. The student was so happy with the first snow he has ever seen that he wanted to _______ a ______. 3. The story doesn't say this, but we can know from it that it _______  _______ in the student's own hometown. 4. When the teacher asked how the student was, she wanted to know if he was _______  _______ with snow everywhere. 5. It was not easy for the foreign student _______  _______ balance in the snow.