MISSING LINK LXXXIX

Each trio of words below contains a Missing Link - that is, its members have something in common, obvious or not. For example, RIVERS, NOSES, & VIOLINS can all have BRIDGES.

1. Level..........Personality..........Difference
2. Track..........Effect..........Wave
3. Proof..........Shed..........Tight
4. First..........Land..........Lunch
5. Moment..........Mirror..........Kingdom
6. Codes..........Books..........Eggs
7. Star..........Sun..........Angel
8. Gate..........Wind..........Pipe
9. Dressing..........Keys..........Rules
10. High..........Varsity..........Year

Answers:

1. Things that can be split
2. Sound
3. Water
4. Lady
5. Things that may be magic
6. Things that can be cracked
7. Kinds of fish
8. Tail
9. House 
10. Junior