1. This states that even through the bad times, the character trusts that everything will be ok because s/he has trust in the heartbeat of the other character. This is an example of trust in others.
2. This quote shows that even if you have a rough past, or grew up poor, you can still be something. This is shown throughout the story when Ponyboy uses his smarts and stands out from the other greasers because he likes to read, write, and go to school.
3. This quote is saying that you shouldn't take your life for granted. The character saying this is both pitiful and regretful about their friend's deaths.
The mood of the beginning of the story The Lottery by Shirley Jackson is _playful_. Later in the story, it becomes tensed. So, according to your question, the answer is "playful"