Chị bé xinh đẹp giúp em với ạ :d

EXERCISE 1: Complete the sentences using the past simple or past perfect simple form of the verbs given

1. The teacher didn’t let her do the exam because when she arrived, the exam ____ (start).
2. When she __ _(write) her letter of application, she sent it.
3. He unlocked the door and __ (step) inside.
4. Before today’s conversation I __ (not speak) to the boss.
5. When the wind _____ (blow), the leaves on the trees shook.
6. They didn’t want to see the film again because they _**__** (see) it twice already.
7. They weren’t hungry because they ____ (eat).EXERCISE 2: Choose the best alternative
8. We had waited/ been waiting for an hour when finally the director arrived.
9. They were tired because they have/ had been running for more than an hour.
10. By the time we got there, they had eaten / been eating all the food.
11. He had written / been writing three novels by the time he was twenty-five.
12. She couldn’t open the door because she had lost / been losing the key.
13. When I saw her face, I knew she had cried / been crying for a long time.
14. The two students couldn’t do the exercise because they had talked / been talking non-stop throughout the sixty-minute lesson.
15. It was 11:30pm when I caught / had caught the bus.
16. By the time he was 50, Einstein wrote / had written many articles for scientific journals.
17. I didn’t watch / hadn’t watched the environment program yesterday.
18. When I arrived / had arrived at the meeting, Angela already left / had already left.
19. Jorge went / had gone to Ana’s house, but she went / had gone out already.
20. Did you hear / Had you heard of James Lovelock before you studied / had studied this unit?