Can we erase the relative pronoun? (who/which/th ...

My mom broke the new glasses which I bought for her.

I think my mom is also looking for the keys that my sister lost last week.

My brother crashed the car which my father gave me for my 25th birthday.

My parents decided to call the doctor that my aunt recommended.

Students who study hard will do well in my class.

My cousin started dating the boy who my sister broke up with last month. (Scandal!)

Students whose grades are low might fail the course.

That building is a museum which is located in the heart of the town.

Do you know the girl who started in Course 23 last week?

I like the paintings that are exhibited in Foro Boca.

Dogs whose owners don't take them out to walk can live very stressed.

My mother who is an excellent cook is thinking of opening a restaurant.