用方框中所给单词的适当形式填空，每词限用一次(每空一词)。 sheep, slow, listen, famous, first 1. The story Snow White is exciting and children enjoy _____ to it again and again. 2. The teacher speaks _____ to the older students so they can always hear clearly. 3. In Australia, you can see lots of _____ in the fields and on the hills. 4. Strauss wrote more than 400 waltzes and his most _____ one was The Blue Danube. 5. Yang Liwei was called 'China's _____ astronaut' when he returned to Earth after his journey into space.