Problem: How does the sentence end?

The car is really dirty and needs a special shampoo while the bike is clean. The 
Answer: car was really dirty so I use shampoo to clean it.

Problem: How does the sentence end?

The diet Michael decided to follow was more efficient than the one  William is following  because 
Answer: William  has too much saturated fat on it.

Problem: How does the sentence end?

The tank that John got for the fishery was not enough to get the fish into it and he ended up using the aquarium. The 
Answer: aquarium is bigger.

Problem: How does the sentence end?

Kayla is not successul in making an invoice so she asks Jennifer for help, because 
Answer:
Jennifer could help her.