Past Perfect Simple or Continuous

It was a relief to find the documents. I (look) ____________ for them all afternoon.

He was dismissed, even though, in his opinion, he ___________ (not/do) anything wrong.

It was not the first time I'd met him. We (meet) ___________ many times before.

He called me at eleven in the evening to tell me that he ____________ (find/finally) a solution.

When he ___________ (finish) his speech, he waited for the reaction of the audience. But no one said a word.

By the time I came back from my business trip, a lot of things ___________ (changed)

The doctor asked me how long I ___________ (have) the symptoms

It was more than a month before we realised what __________ (happen) to him.

We ____________ (work/already) on this project for a month before we found a fundamental flaw.

The invoice ______________ (not/arrive/still) by the end of the week so we sent them a strong reminder.