It's D. The verb 'buy' is transitive as it takes a DO.
Answer: See Explanation
Explanation:
1. Sam (used to) live in Liverpool. Now, he lives in Glasgow.
2. We (didn't use to) have an internet connection but we do now.
3. Did you used to watch DVDs when you were younger?
4. Pete never used to eat fruit, but he does now.
5. I didn't use to have a laptop but now I can't do without it.
6. My dad used to grow his hair long but now, he has short hair.
7. Sally didn't use to wear glasses but she needs them now.
Explanation:
The paying capacity and the willingness of the buyer at a specific price is <em><u>demand</u></em>, while the quantity that is offered by the producers of those goods to its customers or consumers at a specific price is <em><u>supply</u></em>.