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I/
1. A dictionary is a book which gives you the meaning of words.
2. The man whom I talk to yesterday was very kind.
3. Nam whose father's death made him sad a lot is an excellent student.
4. Do you know the children who are playing soccer in the stadium?
5. The little boy who is crying over there lost his way.
6. Kim Lien is a village where Ho Chi Minh was born and lived.
7. Ha Noi is an ancient city where many customs are still on.
8. Vu Quoc Viet whose works I love very much is a famous artist.
9. Teacher's Day is a day when all the students show their gratitude to their teacher.
10. Quynh Dao is a famous writer whose works are widely read all over the world.
II/
1. who
2. which
3. whose
4. whom
5. which
6. whose
7. where
8. who
9. whose
10. what