MISSING LINK CLXXV

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. On..........Off..........Old
2. Fire..........City..........Transit
3. Source..........Wash..........Nap
4. Coins..........Stamps..........Trash
5. Fever..........Break..........Cleaning
6. Sun..........Mass..........Special
7. Bag..........Circus..........Collar
8. Stand..........Stone..........Strong
9. Beach..........Springs..........Sunday
10. Lucky..........Lame..........Sitting

Answers:

1. Guard
2. Rapid
3. Power
4. Things that can be collected
5. Spring
6. Midnight
7. Flea
8. Head
9. Palm
10. Kinds of ducks