1. What do the following words have in common?

IT
AM
ACT
PERT
AMPLE

2.  What do the following words have in common?

EAR
LESS
ANGER

Answers:

1. Each word can be preceded by EX to make a new word:

EXIT
EXAM
EXACT
EXPERT
EXAMPLE

2. Each word can be preceded by END to form a new word:

ENDEAR
ENDLESS
ENDANGER