Подставить правильный вариант ответа.
1. At 9 o'clock this morning Steve (had taken, was taken, took) a test.
2. The thieves (this, hadn't left, had been leaving) by the time the police arrived.
3. Nina want to bed late because she (had been working, worked, was working) on her project.
4. Helen was so tired that she (fell, had fallen, was falling) asleep the minute she went to bed.