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Dear,

Please kindly to see below in the blue sentence, it is correct ?

" I want to make a presentation to promote product."
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Not quite:

I want to make a presentation to promote that/this/the/our product.

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Using a makes it sound as though you want to do a presentation on any old product, you don't care which one.
Students: We have free audio pronunciation exercises.
Comments  
At least:

I want to make a presentation to promote a product.
 nona the brit's reply was promoted to an answer.
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I got it. Thank you for your help.