我对他的理论不太确定，但随后他提出了一个有趣的（看法）。

I wasn't sure about his theory, but then he made an interesting ___observation.

在我的评论中，我想对新政策提出几点（意见）。

In my review, I'd like to make a few ___observations about the new policy.

看完辩论后，她的主要（评论）是两位候选人都回避了关键问题。

After watching the debate, her main ___observation was that both candidates avoided the key issue.