Here are the answers to your questions:
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Different varieties of Spanish are mostly influenced by nearby indigenous languages and cultures.
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In jineteada gaucha, riders are expected to remain on an untamed, bucking horse for up to 15 seconds.
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The most appropriate answer to "¿Vas a la casa?" is Vas a la casa.
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The most appropriate answer to "¿Con quién vas al cine?" is Voy con mis amigas.