MISSING LINK CXV

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. Spot..........Shot..........Dog
2. Ton..........Pint..........Gallon
3. Pet..........Punk..........Little
4. Clock..........Mind..........Sights
5. Trade..........Private..........Middle
6. Party..........Rail..........Degree
7. Date..........Dough..........Pen
8. Navy..........Sky..........Powder
9. Nose..........Sugar..........Traffic
10. Car..........Gene..........Office

Answers:

1. Things that can be hot 
2. Half
3. Kinds of rocks
4. Things that can be set
5. Kinds of schools
6. Third
7. Play
8. Shades of blue
9. Kinds of cones
10. Kinds of pools