III. Give the correct verb form:
1. Two days ago I (put).......... an ad in the newspaper so that I could find a buyer for my old car. Yesterday 1(sell).....it. It (buy)........ by a teenager who (look)............ for an old car to fix up himself. Today a friend of mine told me that he wanted to buy my old car, but he was too late. By the time he talked to me, the car (sell already)......... to the teenager.
2. The wheel (invent)...... over 5,000 years ago. Throughout history, it (assist) ............ people in the making better use of oxen, horses and other animals in transporting goods.
3. Mark is a genius. By the time he graduated, he (offer).. . jobs by dozen computer companies.
4. Ever since it (build)........ three centuries ago, the Tag Mahan in Agra (describe, often)................ as the most beautiful building in the world. It (design) .......... by a Turkish architect, and it (take).............20,000 workers 20 years to complete it.
5. By the time Carol (arrive) ....., we had finished eating and were ready to go.