MISSING LINK CI

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. Opening..........Closing..........Passing
2. Trail..........Chase..........Work
3. Broke..........Wall..........Ground
4. Natural..........Real..........Imaginary
5. Date..........Time..........Agent
6. Pain..........Tongue..........Shooter
7. Dollar..........Dune..........Man
8. Club..........Course..........Ball
9. Boy..........Stop..........Station
10. Bowl..........Maker..........Pudding

Answers:

1. Kinds of bells
2. Paper
3. Stone
4. Kinds of numbers
5. Double
6. Sharp
7. Sand 
8. Golf
9. Bus
10. Bread