Question

a great deal of, a large number of ) dust collected on the desk
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Answer 1

Answer:

a large number of dust has been collected on the desk

Answer 2

Answer:

When there is dust particles in our respiratory system the microvilli in trachea or bronchie push it upward by back and forth movement when its come to chamber behind nose reflex act and we sneeze to throughout dust particle

Explanation:

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