Which sentence has the CORRECT WORD Order?

George: May I speak to Mr. Ben, please? Secretary: I’m afraid he ...................... a meeting right now. Could…

I.......................... nonstop since this morning. I'm starting to feel tired.

------- remain healthy, you need to eat a balanced diet with adequate vitamins and minerals.

The weather… ............... September was very warm this year.

The man......... you spoke to at the party last night used to be my roommate.