The Perfect Past (or the Past Perfect Tenses)

After he _ (finish) speaking, everyone stood up and clapped.

She _ (win) two Oscars by the age of thirty.

We_ (not wait) long when the actors arrived.

He_ (not wear) protective clothing when the accident happened, so he was badly injured.

She _ (know) what job she wanted to do since she was a child.

They_ (plan) the project for months when it was suddenly cancelled.

Many fans _ (queue) since midday to see the stars

He _ (try) to get into acting for years before he got the part in the film

By 1945 Florey and Chain had produced enough penicillin to treat the entire allied forces.

All the three scientists were delighted to know that they had won the Noble Prize.

After Fleming had stopped researching, Florey and Chain took up the challenge.