Answer:
1. Muddy Water - SU (Suspension)
2. Milk of Magnesia - SU (Suspension)
3. Vinegar - S (Solution)
4. Gravel with Water - SU (Suspension)
5. Salt and Water - SU (Suspension) (if mixed thoroughly, then S (Solution))
6. Oil mixed in water - C (Colloid)
7. Gel - C (Colloid)
8. Fog - C (Colloid)
9. Coffee powder mixed in hot water - S (Solution)
please take my answers with a grain of salt..