Column A and Column B

The game is simple. There are two columns of fifteen seemingly ordinary words below. Match the correct word from the left with the correct word on the right, tell me what the common element is in this list, and a Mysterious Master Prize™ fragment shall be yours!

1) snake               A) girl

2) road               B) rat

3) ship               C) wrench

4) rip               D) fly

5) heavy               E) peek

6) first               F) block

7) storm               G) ball

8) monkey               H) aid

9) snow               I) wreck

10) scrap               J) cord

11) cover               K) eyes

12) crystal               L) duty

13) fire               M) shadow

14) sneak               N) iron

15) tunnel               O) job