根据汉语提示填入适当单词,使句意完整。 1. Who was the first man ________________(在月球上行走)? 2. Who do you think ________________(发现美洲)? 3. Mother Teresa spent her life ________________(关心穷人). 4. Elvis Presley was ________________(摇滚乐之王). 5. I think Neil Armstrong was ________________(最伟大的宇航员).