1.The film is about two people whose plane crashed in the jungle. 
2.She is the policewoman whom the driver spoke to
3.This is the house where we often stay in the summer
4.I'll show you the second bookshop where you can find valuable book.

11, That car, the engine of which is very good, belongs to Dr. Clark.
12, I recently went back to Paris, in which I was born nearly 50 years ago.
13, Last week I went to see the house in which I used to live
34, Hoan Kiem lake, the water of which is always blue, is a historical place.
15, A man who answered the phone said Tom was out.
16, Thank you very much for the present which you sent me
17, The flight which we wanted to travel on was fully booked
18, The man who sat next to me, talked all the time
20, All of the people that I asked to my party can come.

Giải dùm mình
- He was the last man that was interviewed yesterday. ( Reducing relative clause )