Past Perfect /Past Perfect Continuous

When we came back home, the children ___ for two hours.

Tina ___ home when I phoned her.

Sean explained why he ___ an essay.

Claire said she ___ her sister since last month.

I didn’t see Jim yesterday. He ___ abroad.

We were very tired at the end of the trip. We ___ for ten hours.

Andrew said he___ to China before.

Mike said they ___ at the airport for two days because of the delay of their flight.

They ___ the same restaurant for years before they found a better one.

When Bob arrived at the station, his friends … already … for him for half an hour.

How long … you … in Moscow before you moved to St. Petersburg?

By the time he found his girlfriend, he … for her in the mall for an hour