MISSING LINK LXI

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. Houses..........Computers..........Pianos
2. Diploma..........Puppy..........Rumor
3. Hour..........Tolerance..........Gravity
4. Sun..........Building..........Road
5. Whole..........Road..........Hedge
6. Blush..........Edition..........Impression
7. Music..........Facts..........Consequences
8. Auction..........Partner..........Night
9. Spirits..........Test..........Frequency
10. Lady..........Box..........Room

Answers:

1. They all have keys
2. Kinds of mills
3. Zero
4. Block 
5. Hog 
6. Things that can be first
7. Things that must be faced
8. Things that may be silent
9. High
10. Lunch