Problem: Maria used some acid to clean stains on the equipment but it didn't work because the

My choice: acid was too weak.

Problem: They stopped chanting in the streets and silence ensued after the crash as the

My choice: chanting was inappropriate at the time.

Problem: William helped Christopher install the program on the computer because

My choice: Christopher was inept with computers.

Problem: The cat of Joseph had bad behavior compared to that of Jeffrey because

My choice:
Jeffrey took care of it.