The sentences as written are incorrect. Here are corrections:
People who travel to other countries are required to have a passport.
A set of twins that is not identical is called fraternal.
36
12-6 USING PREPOSITIONS IN ADJECTIVE CLAUSES
The woman I spoke to
was very nice.
37
12-6 USING PREPOSITIONS IN ADJECTIVE CLAUSES
(a) I spoke to the woman. She was very nice.
(b) The woman I spoke to was very nice.
preposition + object pronoun
preposition + subject pronoun
to
to adjective clause
38
12-6 US