IN:
Multi-choice problem: [they]

UPS provides much convenience to the customers with their drop off service since they make the shipping of packages extremely easy.

OUT:
UPS

IN:
Multi-choice problem: [he]

Medvedev will cede the presidency to Putin because he is more popular.

OUT:
Putin

IN:
Multi-choice problem: [it]

The elephant trampled a fish and it continued on its way.

OUT:
The elephant

IN:
Multi-choice problem: [they]

Professors do a lot for students, but they are rarely respected.

OUT:
Professors