Grammar--Who or Whom?

Question

Hey, can you guys help me with this?

1. The goddess turned Arachne into a spider, _____ kept on weaving.
2. Athena’s tapestry showed the gods punishing mortals _____ angered them.
3. Arachne’s cloth showed mortals _____ the gods had fallen on love with.
4. A Greek myth tells of Arachne, _____ challenged Athena.
5. Athena, _____ the Greeks worshiped, was the goddess of weaving.

Either who or whom belong in the blanks, but I don't understand it.
Help me fill in these blanks, please?

Answer 1

Who is a subject.
Whom is an object.

1. Who
2. Who
3. Whom
4. Who
5. Whom

Answer 2

1. Who
2. Who
3. Whom
4. Who
5. Whom

Answer 3

1. who
2. who
3. whom
4. who
5. whom

Answer 4

1. who
2. who
3. whom
4. who
5. whom