My bag is the one _____ you tripped over.
that
My brother is the boy who is cooking.
This is correct.
She is the girl ____ I was telling you about.
that
This is the picture frame who is broken.
This is incorrect. Change "who" to "that".
Ezz is the boy who loves soccer.
who loves soccer
This is the pencil _____ I like most.
which / that
That
Who
Are used when talking about people
She is the girl which sold me the bike.
This is incorrect. Change "which" to "who" or "that".
The bike which had a broken wheel was useless.
which had a broken wheel
Mary brought the cake ____ tasted so delicious?
which/ that
Is that the sofa who has dark colour?
This is incorrect. Change "who" to "that" or "which".
Nablus is the city where I was born.
where I was born
Is America the country _______ people celebrate Halloween?
where
Where
Is used when talking about places
BONUS
BONUS
This is the teacher who gave me a sticker.
who gave me a sticker