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Dear Sir,
I would like to thank you for giving such an informative talk. Our class enjoyed it very much.

We all appreciated the talk because the topic is very important to teenagers of our age. It was interesting to hear the opinion of a professional. You explained the situation so now we can see clearly the whole problem, which is obviously important.

I wonder if you could come to our school again and speak on that topic to another class. I think all students should be aware of that problem.

 Let me know if you could. Thank you in advance for your help. I look forward to hearing from you.

Yours faithfully,
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