Sentence 1: Gating was a distance runner. 
 Sentence 3: He was the anchor leg 
 Sentence 4:  He flew around the track 
 Sentence 5:  His teeth were clenched tightly 
 Option 1: He had to do a 1600 meter relay but wasn't the anchor leg. 
 Option 2: He had to do a 1600 meter relay.