B.) by identifying the topic, medium, and supporting sentences
I hope this helps! Good luck in your studies!
I'm not sure if these are right but these are what I think the answers are:
1. Hole
2. Horizon
3. Glove
4. Coffin
5. Stamp
Chambers testified before the HUAC against Hiss and claiming that Hiss belonged to an underground communist organization.
should be " testified " and " claimed "....so their both past tense