My book is the one _____ you tripped over.
which/that
Sione is reading a book which is hard to understand.
which
The boy who was fishing is my brother.
Correct
This is the cake that I shared with her.
that I shared with her
She is the girl ____ I was telling you about.
who/whom/that
I hit my knee on that table.
None (that is a demonstrative adjective)
The picture frame who is broken is in the garbage.
This is incorrect. Change "who" to "which/that".
Jim is the boy who you knew.
who you knew
_____ pencil did you borrow yesterday?
Whose
The pizza, which was very good, was topped with pepperoni and sausage.
which
She is the girl which sold me the bike.
This is incorrect. Change "which" to "who/that".
The buggy which had a broken wheel was useless.
which had a broken wheel
____ brought the cake ____ tasted so delicious?
Who and which
With whom am I speaking to?
None (Whom is an interrogative pronoun)
Is that the couch whom has a ripped cushion?
This is incorrect. Change "whom" to "that/which".
Carrie is the one whose story was in the paper.
whose story was in the paper
_____ did you speak to about buying that toy?
Who/Whom
Sandra is the person who dropped that plate on the floor. (2)
who (that is a demonstrative adjective)
With whom did you go to the store?
Correct.
Richard, whom you met yesterday, said he was pleased to meet you.
whom you met yesterday