[Q]: How does the sentence end?

In the garden, Betty is having more success with growing flowers than Kayla due to

[A]: Kayla using a weak fertilizer.

[Q]: How does the sentence end?

Megan knew they had to stop smoking because it was unhealthy but Elena did not because

[A]: Elena was silly.

[Q]: How does the sentence end?

Justin told Robert that he had converted to Islam last week.

[A]:
Robert was shocked.