Open the brackets and put the correct pronoum нужно поставить ван или ванс I havent got a textbook. I must buy (one_ones)

1) I haven\'t got a textbook. I must buy one. 2) I don\'t like these yellow flowers. Let me have some red ones. 3) This story is more interesting than that one. 4) This exercise is more difficult than the one we did yesterday. 5) My TV set is old. I must buy a new one. 6) I haven\'t got a flag. I have to buy one. 7) I dislike these books. Give me another one. 8) This river is longer than that one.