5)During the first observation the water was green, the wildlife was not so present and the number of tourists was extremely high but six(6) months later the water has regained its natural colour, the wildlife was back to normal and the number of tourists has dropped greatly.
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1) Yes, they have.2)No, they have not.
3)Yes, they have.
4)No, it has not.
5)During the first observation the water was green, the wildlife was not so present and the number of tourists was extremely high but six(6) months later the water has regained its natural colour, the wildlife was back to normal and the number of tourists has dropped greatly.
7) disappeared...has not returned.