Sentiences 3 and 8 because they express emotional thought other than fact. For sentence three, using "terrible waste" can be debateable and shows more of an opinion. And sentence 8, by using "shouldn't" showing its still a posssiby something can or can not happen.
The west as ayatollah khomeinjni
Answer: To our Sponsor,
Thank you for your support it was much needed. Our english club is doing much better now that you've provided funds for us to run it correctly. The event was a huge success, and we just wanted to thank you for the certificates and rewards that you have provided for us.
-Thank you,
Secretary of the English Club
Explanation: