Choose the most appropriate answer. 1. He a new car last month, but he doesn't really like it.
bought was buying had bought had been buying
2. I burned my finger while I breakfast.
was cooking had cooked had been cooking
3. By the time I came back, Mike and Jane , so I couldn't tell them about it.
were already leaving had already left had already been leaving
4. He for twenty years when he finally quit smoking.
smoked was smoking had been smoking
5. I you yesterday because my telephone was out of order.
didn't call hadn't called hadn't been calling
6. He was waiting for his bus at the bus stop when the robbers him.
attacked were attacking had attacked had been attacking
7. I wanted to ask my son for help, but I saw that he , and I decided not to wake him up.
slept was sleeping had slept had been sleeping
8. Yesterday I went to an interesting museum that I before.
didn't visit wasn't visiting hadn't visited
9. By the time we arrived, she for us at the train station for three hours.
waited was waiting had been waiting
10. Christopher Columbus America in 1492.
discovered was discovering had discovered had been discovering
