MISSING LINK CCXXII

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. Iron..........Frog..........Best
2. Self..........Room..........Tea
3. Box..........Corps..........Agent
4. Court..........Field..........Stage
5. Mail..........Money..........Short
6. Shake..........Share..........Trade
7. Spoon..........Dollar..........Lining
8. Side..........Study..........Follower
9 . Votes..........Sheep..........Calories  
10. Wheel..........Estate..........Amendment

Answers:

1. Man
2. Service
3. Press
4. Center
5. Order
6. Fair
7. Silver
8. Blind
9. Things you can count
10. Fifth