Where can you found a declamation piece about sports?

well, can find declamation speeches online or you can ask an English or speech teacher if they have any suggestions.

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There are some paperback books on the market that are collections of many of history's greatest speeches. Check out any good bookstore. You might also find similar material in your local public library. Ask your librarian. If it is not in your local library, it can be ordered for you from another library. (There is sometimes a modest fee involved in having a book ordered.)

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you can also visit takdangaralin.com