Melody Brooks is frustrated. She's been placed into a program for slow learners, although she's quite a bit smarter than all of her peers. Not only is the program way below her level, they spend weeks just learning about a single layer of the alphabet, which drives Melody crazy.
Answer: Caused to be a certain nature
Explanation:
If you replace the word “rendered” with “caused to be” the statement still makes sense. A good rephrasing would be:
The sad cries of the many slaves, horrible yesterday, are made worse by the joyous shouts that they hear.
