1.Cars cause pollution,people still want them (although) 2.Ba ate a lot of food.He wasn very hungry (although) 3.the novel has been lost.you gave me that novel on my birthday(which) 4.Miss lien is my english teacher. she sings very well (who) 5.viet nam exports rice.viet nam is in south-east asia (which) 6. the boy is my friend . I borrowed his book last week(whose) 7.the men the elephants are from china.you saw them on TV last night (that) 8. do you remember the teacher.you met him at the station(whom)