The past perfect simple and continuous

The past perfect is used with the same expressions we use with the present perfect (already, just, since, for, never, ever, etc.)

Choose the correct form for the past perfect continuous

I ___________ about that book until you mentioned it yesterday.

I _______________ to contact him, but he didn't answer my call.

It was only four o’clock but eyeryone ___________ the office.

_____________ we booked our tickets, we had searched for the hotels on the net.

When Sally saw me , I _______________ for 3 hours.

Achraf wasn't at home when I visited his place. He _______________ out.

Ms Jamila no longer had her car. She _______________ it.

When he was driving to work he realized that he _______________ to take his pendrive with him.