1. Hard work is the key success. 2. He taught his children to be respectful 3. She's very loyal her friends. 4. We care each other here, like a family. 5. He's a great fan country music. other cultures.

Here are the completed sentences: 1. Hard work is the key **to** success. 2. He taught his children to be respectful **of** others. 3. She's very loyal **to** her friends. 4. We care **for** each other here, like a family. 5. He's a great fan **of** country music. 6. **of** other cultures. (It seems like there's a missing part for this sentence. It could be: "He is interested in **learning about** other cultures.") Feel free to ask more questions or for further clarifications!