NPR Weekend Edition Sunday Puzzle
April 24, 2016
Will Shortz

HAPPY 90th BIRTHDAY (to a friend)  

The clues below can be answered with  two-word phrases which have something in common.

1. Tailless feline
2. Iowa metropolis
3. Rude jeering noise
4. It's wicked
5. Greek or Russian religious institution
6. Long-gone filing system unit
7. Warehouse tool, perhaps
8. IRS, for one

HINT:
The first word of each answer ends in X.

Answers:

1. Manx cat
2. Sioux City
3. Bronx cheer
4. Wax candle
5. Orthodox Church
6. Index card
7. Box cutter
8. Tax collector 

The first word of each answer ends in X, and the second word starts with C. (XC - 90 in Roman Nunerals)