Here’s a possible way to fill in the blanks:

The Importance of Friendship
Friendship is a (1) **vital** part of a teenager's life. Friends provide (2) **support** and companionship during a time of many changes. Many teenagers enjoy spending time with friends at school and in their (3) **lifetime**. They might hang out at the park, play video games, or go to the movies (4) **together**. Good friends help each other through (5) **difficult** situations. When a teenager is feeling down or (6) **stressed**, a supportive friend can make a big difference.