difficult, Not easy to do or understand, attention, Looking or listening carefully, borrow, To take something for a short time and give it back later, principal, The head of a school., available, Ready to use or get, resources, Things that help you learn or work, grow, To become bigger or taller, developing, Growing or becoming better, research, To study or look for information, solve, To find the answer to a problem or question, look for, To try to find something, focus on, To give your attention to something, invest, To put money, time, or effort into something to make it better in the future, lend, To give something to someone for a short time, become, To change into something or someone, challenge, Difficult things that you need to solve

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