The paragraphs describing the playground include:
 1. Instantly, the playground was crowded and bustling.
 2. The playground was boiling and there were shouts everywhere.
 3. When it comes to PE classes, the playground is very busy, some skipping, some running.
 4. After class, the playground immediately boils up: some students run like arrows; Some play with others to catch chickens; Some sing songs; Others organize people to play Idiom Solitaire. Everyone happily played the game, and the laughter engulfed the whole playground.
 5. After class, the students rushed to the playground, which was boiling like boiled dumplings.
 6. The playground was bustling with colorful flags.
 7. On the playground, students in groups, some chatting, some reading, some running, very lively.
 8. After class, we ran to the playground to play games, some throwing sandbags, some skipping rope... The quiet playground suddenly became lively.
 9. The students' nimble figures and fierce cries can be seen everywhere on the playground.