That or Who

The new cellphone _________ I bought yesterday is very fast.

My father buys a new car _______ is very expensive.

My teacher is a woman ________ comes from Rusia.

The teddy bear ________ is pink was thrown away.

The girl _________ you saw yesterday is my best friend.

The boy ________ is watching tv is my son.

Dan's sister, _______ lives in Holywood, is an actress.

The books _________ I borrowed were amazing!

Marie is the classmate ________ helped me study the exams last semester.

What is the relative pronoun in this sentence:

An airplane is a machine that flies.

• an

• a

• that

• is