1.The book I am reading is very interesting.
2.The trees which were big fell down .
3.The drosses She wanted were too expensive.
4.She wants a doll which（can） walks and talks for her birthday .
5.Iwe lost the umbrella I bought last week.
6.I passed the exams which were not very difficult
7.This is the car I have just brught .
8.The street We are walking aloup is called Fifth Avenue.
9.The books I bought very expensive.
10.The store which is across the street is the biggest in this city.