Sentence 1: I went by the lake to observe the winter geese. 
 Sentence 3: I sat on the grass and waited for them to take flight 
 Sentence 4:  After fifteen minutes, they started to move and flapped their wings 
 Sentence 5:  I saw them leave as the sun was reflecting gold on their wings 
 Option 1: The sun was setting down and the geese were many. 
 Option 2: The sun was setting down and all the geese disappeared.