1d) was designed (long time ago so past tense)
2d) Has been repaired (It is still going on the present, this year)
3c) Had discovered (He discovered America long time ago)
4a) To have worked (worked long ago when he was young)
Hope it helps!
He's called the "Beginner of the Earth" because he is the connection between the tribe and the sky god.
The unfair gibe was cruelty all those who worked so hard on the project
