Question:
Thomas pursued Peter, but he fell behind.

he
Answer:
Thomas
Question:
Kyle purchased three new monitors due to a recommendation by his brother, because he wanted to increase his productivity.

he
Answer:
Kyle
Question:
UPS provides much convenience to the customers with their drop off service so they are encouraged to bring their packages in more often.

they
Answer:
the customers
Question:
U.S. Authors are fighting against Amazon's book lending program because they allow users a free book every month.

they
Answer:
Amazon's book lending program