MISSING LINK CXXX

Each pair or 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. Smoke..........Gang..........Letter
2. Line..........Square..........Break
3. Mushroom..........Bean..........Pea
4. Cattle..........Sunday..........Disk
5. Luck..........Button..........Stroller
6. Waters..........Patience
7. Essay exams..........Car dealers
8. Pilot..........Night..........Head
9. Night..........Prayer..........Auction
10. Power..........Wind..........System

Answers:

1.  Chain
2. Kinds of dancing
3. Kinds of soup
4. Kinds of drives
5. Things that can be pushed
6. Things that can be tested
7. They use blue books
8. Kinds of lights
9. Silent
10. Solar