1. The fish swim happily in the water.

2. The fish in the pond gently spit out a series of small bubbles.

3. The little fish in the pond are swimming around, very happy.

4. Sewage is continuously poured into the river, and the lives of the fish are in danger.

5. The fish swim freely on the bottom of the water.

6. As soon as the fish food was thrown into the water, fish from all directions swam over in a hurry.

7. The fish are swimming around in the water, looking very happy.

8. If the sewage from the paper mill is discharged directly into the river without treatment, the lives of the fish will be in danger.

9. The fish swim happily in the clear water.

10. If the sewage from the paper mill is discharged directly into the river without treatment, the lives of the fish will be in danger.

11. In the clear stream, there are not only fish, but also shrimps, crabs, etc.

12. The fish swim freely in the water, in groups, and they look so happy.