This is a participle. It cannot be a gerund, because gerunds have a nominal or adjectival meaning (for example, Swimming is fun - swimming would be a gerund). The -ing form itself is not a 'verb phrase', but 'sneezing uncontrollably' is. So if we are looking only at 'sneezing', the answer is 'participle'.
Poets use imagery in poems to help establish spark off the senses
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Answer:
An onomatopoeia is a word that mimics the sound it names
like buzz, whoosh and boom
