Fill in: the weather, feet, color, flies

1.I saw men and women rushing back and forth within the flames. They would run along, then came the choking smoke and they would drop like dead _____ .
2. I don't think I'm going to school to day. I'm feeling under _______.
3. He decided not to go shopping because He felt a bit off ________.
4. My sister is back on her ______ after losing her job last year.