The following words can be changed into phrases according to a certain pattern. The phrases will have two things in common. What are the phrases and what do they have in common?

1. Living
2. Errors
3. Arms
4. Wheat
5. Dawn
6. Worms
7. Thousands
8. Habit
9. Duty
10. Passion
11. Law
12. Death
13. Origin
14. Silence

HINT:
The clue word is the last word of the phrase.

Answer:

Each clue word can be the last word of a familiar phrase in the form of ________ of ________, with the first word beginning with "C":

1. Cost of living
2. Comedy of errors
3. Coat of arms
4. Cream of wheat
5. Crack of dawn
6. Can of worms
7. Cast of thousands
8. Creature of habit
9. Call of duty
10. Crime of passion
11. Court of law
12. Cause of death
13. Country of origin
14. Code of silence

Credit:
Will Shortz
The Puzzlemaster Presents Vol. 2 
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