"Word Power"

Solve this and improve your word power!

Three of a kind : The words in each set below share a single feature. For example, a compass, a phonograph and a pine tree all have....needles. The triplets below are tougher, but here's a clue: Each answer is a seven-letter plural ending in "S".

1. Thermometer, college graduate, location on a globe -------s
2. Mattress, health resort, year -------s
3. Television, cricket field, windows -------s
4. Greek building, newspaper, marching army -------s
5. River, nose, denture -------s
6. Ion, credit card bill, cavalry -------s
7. Tennis player, noisy party, mafia ring -------s
8. July, locker room, blessings -------s
9. Bed, sandwich, rumour -------s
10.Crossword puzzle, post office, initials -------s