MISSING LINK LIII

Each trio of words below shares a Missing Link - that is, its members have something in common, obvious or not. For example, RIVERS, NOSES, & VIOLINS can all have BRIDGES.

1. Attendant..........Plan..........Risk
2. Atlas..........Hazard..........Block
3. Magic..........Negative..........Prime
4. Video..........Police..........Ticker
5. Mind..........Crowd..........Pest
6. Time..........Load..........Will
7. Face..........Leg..........Tooth
8. Hot..........Twin..........Hospital
9. Old..........Trade..........Charm
10. Empty..........Halfway..........Full

Answers:

1. Flight
2. Road
3. Kinds of numbers
4. Kinds of tape
5. Kinds of control 
6. Free
7. Dog
8. Bed 
9. School
10. Kinds of houses