Problem: How does the sentence end?

I was planning to make minced garlic and opted to use the food processor instead of a knife because the
Answer: food processor is quicker.

Problem: How does the sentence end?

Jessica asked Christine for help with tying the necktie, because
Answer: Christine was a master with the Windsor knot.

Problem: How does the sentence end?

Robert bought a pet hamster for Adam because
Answer: Robert wanted to give a great gift for Christmas.

Problem: How does the sentence end?

Dennis was installing solar panels on Brian's roof when he slipped and fell off the roof.
Answer:
Dennis yelled for help and for someone to call an ambulance.