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The poor boy had a serious chest ______ which had spread into his lungs causing a very painful cough.

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Foot and mouth disease is caused by a highly _______ virus which animals either eat or inhale.

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People can fight infection more effectively if they eat a nutritious diet.

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Some unhygienic conditions encourage the _______ of disease.

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A well- ______ diet is the key to a happy and healthy life.

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Since my grandfather learnt to use Facebook, he ______ many interesting stories on it.

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All living organisms have to adapt to changes in environmental conditions.