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Although you're better of using strong alkalines.

That ambiguous ending left me hanging and twisting in the wind.

Who watched, not whom watched. "Whom" is only applicable for the object of a clause.

Completely unrelated, but I only recently learned and became comfortable with this distinction (despite somehow intuiting it in my use of the word) after getting further in my German and French classes. We seem to do a poor job of actually teaching English grammar in this country, and then we stumble upon these rules when learning other languages!

I only really learned English grammar properly when I studied Latin in high school.