What do the following words have in common?

1. SIT
2. PER
3. CAR
4. AND
5. RILE
6. KING
7. SAGE

HINT:
Each word can be preceded by the same two letters.

Answer:

Each word can be preceded by VI to make a new word:

1. VISIT
2. VIPER
3. VICAR
4. VIAND
5. VIRILE
6. VIKING
7. VISAGE