[Q]: How does the sentence end?

My dog had bacteria in his mouth that was less dangerous than the leg infection, because the 

[A]: infection might kill him.


[Q]: How does the sentence end?

Natalie laughed when Laura fell off the horse although 

[A]: Laura thought it was really painful.


[Q]: How does the sentence end?

The track was no longer good for training so he went to the gym, because the 

[A]:
gym was leading him to his goals.