[Q]: How does the sentence end?

My mom used the yarn a lot less than the fabric, because the

[A]: yarn was a lot weaker.

[Q]: How does the sentence end?

At school, Tanya loves games, while Monica is always focused on studying, so

[A]: Monica is more serious.

[Q]: How does the sentence end?

Sally knew not to ask the doctor for antibiotics when her illness was caused by a virus rather than bacteria. Only the

[A]:
bacteria would respond to antibiotics.