1. The same two letters, in the same order, will complete the following two words:

_ _ PHA
_ _ OHA

2. The same three letters, in the same order, will complete the following two words:

_ _ _ RM
_ _ _ SM

3. The same four letters, in the same order, will complete the following two words:

UN _ _ _ _
QU _ _ _ _

Answers:

1. ALPHA - ALOHA
2. CHARM - CHASM
3. UNEASY - QUEASY

Credit: Will Shortz
NPR Weekend Edition Sunday Puzzle