I think one of the best way to improve your spoken english is to try out more tongue twister. Dont worry, even native English speakers find the tongue-twisters on this page difficult to say quickly. Anyway, have a go...
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How much wood can Chuck woods
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Shirley Sherman shivered
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Big bear bit
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Duck likes lakes
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Seashells sells
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Pot roast roast
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Say it 3 times in a row
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Peter piper picks a peck
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Denise sees the fleece
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Shoe shine shop
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I wish to wish the wish you wish