Here are some possible ways to rewrite the sentences to make them more natural: Sold museum tickets and provided customers with explanations of exhibits and rules. Responded to inquiries in English and Korean about exhibits and the surrounding areas, as needed, while maintaining a focus on customer satisfaction. (Assuming you want to emphasize that you are customer-oriented and can communicate in multiple languages.) Remember to use active verbs and avoid repeating the same words. Additionally, it may be helpful to quantify your achievements, such as by mentioning how many customers you served or how many languages you can speak fluently. Finally, make sure to proofread your CV carefully to avoid any typos or grammatical errors. Good luck with your job search!

・Sold tickets, gave customers some explanations [<-- can you think of a word more specific/descriptive than "explanations". It's vague, but I can't change that without knowing more context.], and made them aware of prohibited areas within the museum. ・Handled inquiries about the exhibits and surrounding areas---sometimes/often in English or Korean as needed. (My own native language is Japanese.)