He was an American citizen for 20 years when the war had broken out.
He said he had spent the last 15 years of his life exploring the world.
I couldn't buy the record because I had lost the money
I didn't go to the museum with my class because I had been there before
When we had bought the house, it was empty for several years
Не уверена в правильности, но, как говорится, помогла, чем смогла)
This music has been heard by nobody yet. (Эту музыку еще никто не слышал.)
has been heard - Present Perfect Passive
Are you going to walk tomorrow(ты идешь гулять завтра)
9 - fastest
10 - older
11 - faster
12 - best
13 - tallest
14 - better
15 - laziest
16 - worst