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）.
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