Fill in: is, was, were, will be, have1) The Brothers Karamazov

Fill in: is, was, were, will be, have
1) The Brothers Karamazov ........ written by Fyodor
2) The museum ........ opened by the mayor next week
3) Two buried statues ......... found last Monday
4) The site ......... visited by thousands every year
5) The invitations .......... already been posted