Problem: Fred covered his eyes with his hands , because the wind was blowing sand around. He lowered *them* when the wind stopped.
Are "them" and "his hands" the same?
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Answer: yes

Problem: Thomson visited Cooper 's grave in 1765. At that date *he* had been travelling for five years.
Are "he" and "Thomson" the same?
****
Answer: yes

Problem: I put the cake away in the refrigerator . *It* has a lot of butter in it.
Are "It" and "the refrigerator" the same?
****
Answer:
no