The answers to the clues below will have something in common.

1. Common greeting
2. Gone forever
3. Former Cadillac model
4. Informal rules
5. "Just copy me."
6. Yum Yum or Dunkin' purchase
7. One selling strategy

Answers:

1. How do you do
2. Dead as a dodo
3. El Dorado
4. Do's and dont's
5. Do as I'm doing
6. Dozen doughnuts 
7. Door-to-door 

Credit: Chicago Tribune Crossword
Annabel Michaels
(A Puzzle to) DO TWICE