#4 should say that crocodiles normally inhabit the river. Stating the "river is being used by crocodiles" is in the present tense and represents a fact that not all the animals attended the meeting.
There is no such thing as a refrigerator that could contain a giraffe and/or an elephant. The correct term would be to use a walk-in "cooler."
The kids do better than adults because kids are, well, stupid.
