"The Bet" is a short story by Anton Chekov, Chekhov, or Checkov (whichever you prefer). I have taught it with my Honors 10, Basic 12, Film and Novel, and Creative Writing classes. High school students enjoy this story mostly because of the initial premise. I liked it as a teacher because I could check off (Chekov) a frame story, World Lit, and philosophy.
"The Lonely" is a Twilight Zone episode with a number of similarities to the short story, but also quite a few differences, and many of those differences are in the details.
I combined these two classic stories wonderfully when I used them in my Film and Novel class. This download provides you with the assignments I used. While these are not my ACT prep reading quizzes, they do provide an assessment. The quizzes are available on Quizstar, and the import codes are part of the this download. Students really enjoy the Activity Log worksheet. Also, the Compare/Contrast can be used as summative or formative, and it can be used for ANY story pairing.
Besides the use of this document, I would also suggest reading the first part of the story together. Some students will have trouble understanding the frame story if you just assign the reading as homework.