Sentence 1: Otis went to the swimming pool with his sister. 
 Sentence 3: Otis did a flip into the water 
 Sentence 4:  He landed on his back with a smacking noise 
 Sentence 5:  Otis swam to the edge of the pool to get out of the water 
 Option 1: He climbed the ladder of the tall slide. 
 Option 2: He climbed the ladder of the tall diving board.