Problem: How does the sentence end?

Mary has taken a karate class, but Rachel never has, so 
Answer: Rachel is the one who is worse at defending himself.

Problem: How does the sentence end?

Justin doesn't have as much foresight as Brett does because 
Answer: Justin does not possess a sixth sense.

Problem: How does the sentence end?

Nick quite often likes to drive too fast but Robert never does because 
Answer: Robert is sensible.

Problem: How does the sentence end?

Donald told Michael how we was going to start eating healthy by eating rice.  
Answer:
Michael was unconvinced.