MISSING LINK CLXXIV

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. Count..........Shop..........Guard
2. Pull..........Heart..........Apron
3. Night..........Normal..........Nursery
4. Hard..........False..........Child
5. Open..........Fair..........Trick
6. Boy..........Girl..........Trap
7. Book..........Swing..........Stand
8. Job..........Team..........Girl
9. Blood..........Lots..........Attention
10. Police car.....Bakery cookie.....Clear distinction

Answers:

1. Body
2. Strings
3. Kinds of schools
4. Labor
5. Kinds of questions
6. Words that can follow "It's a ...............!" 
7. Check
8. Dream
9. Things you can draw
10. Things that can be black and white