Выберите правильную форму глагола.a)They have seen / saw the tower "Baiterek".b)They saw /have seen the concert last

a) They have seen the tower \"Baiterek\".b) They saw the concert last week.c) They love Rock and Roll. I have liked it all my life.d) They bought a lot of interesting books after the concert.e) They have stayed in Astana since October.f) They have known each other for 5 years.g) When did they go to Astana?h) Dmitry went to Astana 3 months ago.j) Omar has lived there for 5 months.