Past Perfect

1. When she .... on the course, she had never studied a foreign language before.

• enrolled

• had enrolled

2. When I closed the door, I realised that I ... my keys inside.

• left

• had left

3. She looked really sad but I didn't know what ... .

• happened

• had happened

4. ... when you rang the doorbell?

• Had Sai already left

• Did Sai already leave

5. This is the oldest building in the town. It ... over 200 years ago.

• was built

• had been built

6. By the time I moved in, they ... the building work.

• finished

• had finished

7. I opened the door, and ... inside.

• went

• had gone

8. I looked in the letter box yesterday and the letter still ... .

• didn't arrive

• hadn't arrived

9. By the time I could talk to her, she ... to quit her job.

• decided

• had decided

10. I looked at the photo and suddenly realised that I ... that man somewhere before.

• saw

• had seen