Read these sentences and fill in the gaps with the correct verb form in the past perfect continuous.

Example 0. John __________ his dog all day. He was tired yesterday. (walk)

Answer 0. had been walking.


1. Her friends ?ОТВЕТ?
of calling the police when she walked in. (think)

2. I was exhausted because I ?ОТВЕТ?
awake too late. (stay)

3. She ?ОТВЕТ?
English for four years. It was exciting. (learn)