Past perfect

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

• enrolled

• 'd enrolled

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

• left

• 'd left

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

• happened

• 'd happened

4. ___ when you rang the doorbell?

• Did Sai already leave

• Had Sai already left

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

• was built

• 'd been built

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

• finished

• 'd finished

7. I opened the door, and ___ inside.

• went

• 'd gone

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

• didn' t arrive

• hadn't arrived

We had already eaten when John ____________ (come) home.

• came

• come

Last year Juan _____________________ (pass) all his exams.

• had passed

• passed