[Q]: How does the sentence end?

Matthew is a public health expert, Justin is not therefore

[A]: Justin would not be best at explaining the danger of mold.

[Q]: How does the sentence end?

Katrina wanted to care for kittens while Betty wanted to care for snails because

[A]: Betty likes slimy animals.

[Q]: How does the sentence end?

Strength-training is a good idea for Adam but not Matthew because

[A]:
Matthew is recovering from an injury.