2. The classroom is the grassland and the stage where you run.

When a needle falls quietly on the ground, the classroom can hear the sound.

The classroom is really quiet, just like the dark universe.

A classroom is just a ray of sunshine, which is the hope in your heart.

The classroom is like a mosquito nest, and the students are whispering.

7. The classroom at night is as quiet as a forest.

8. From time to time, the teacher's lecture and reading sound came from the classroom, like a harmonious sonata.

9. The noisy classroom suddenly became quiet, as if it had been turned off.

10, the classroom is really big, the green floor is like a vast grassland, and the white wall is like an infinite blue sky, which is very comfortable.

1 1. After the students cleaned the classroom, it became bright and clean, and people could be reflected on the floor, as if they were in a clean five-star hotel.

12, the classroom is really lively, just like the vegetable market.

13, the classroom is noisy like a bee.