1.Tom’s brother works in the company,¡¡¡¡¡¡¡¡¡¡¡¡ computers are made. 

´ð°¸where/in which

2.I live in a new house ¡¡¡¡¡¡¡¡¡¡ windows face south. 

´ð°¸whose

3.I study in the classroom,in front of ¡¡¡¡¡¡¡¡¡¡stands a big tree. 

´ð°¸which