Her children, Anshar, Kishar, and Anu, were being very rowdy and they didn't stop even after Apsu confronted them about it.
A comma. Introductory phrases are dependent clauses. Example: If the students want to win, they have to practice.
3. would be/knew how
The first blank must be future tense because the word after it ends in -ing
The second blank must be ____ how, and it must be past tense, so knew how. She knows <em><u /></em><em>why </em>the business would be started, to provide a great public service, but not <em>how</em>.