Вставить:
1) a-did b-have c-had
2)a-hasn't b-haven't c-didn't
3)a-'ve just read b-haven't c-didn't
4)a-didn't go b-he'd take been c-wasn't
5)a-knew b-known c-knows
6)a-since b-yet c-for
7)a-write b-wrote c-written
8)a-for b-since c-just