MISSING LINK CLVIII

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. Thick..........Thin..........Clear
2. Night..........Down..........Gear
3. Love..........Lady..........Litter
4. End..........Canal..........Loading
5. West..........Note..........Lime
6. Land..........Water..........Short
7. Selling..........Tipping..........Talking
8. Elevator.....Stock Market.....Window shade
9. Male turkey.....Private eye.....Annoy constantly
10. 3/4 - for one.....1,100 ft/sec.....186,000 miles/sec

Answers:

1. Skin
2. Shift
3. Kinds of bugs
4. Kinds of zones
5. Key
6. Fall
7. Types of points
8. Things that go up and down
9. Tom, Dick, and Harry 
10. Speed of music, Speed of sound, Speed of light