The door … … (to lock) 1 was locked 2 were locked 3 was lock 4 locked 5 lock

Was locked. Was потому что единственное число времени; locked потому, что закрыли её и в времени. В английском языке глагол не имеет рода в времени, поэтому в данном случае надо перевести глагол, опираясь на контекст (слово дверь женского рода) - была, а не был заблокирована/закрыта ( у слова locked есть два значения)

Dear friend,
i am going to tell you something about my spring holiday. i always travel with my parents. I visited two countries: Norway and Finland.  In Norway i saw a lot of beautiful landscapes such as "tongue of trolls", "ladder of trolls". In Finland i was in the village of Santa Clause and saw the big castle "olafsborg". Both countries are amazing, wonderful and really beautiful. i think i will visit them again in near future. Of course, i bought for you some presents. one of this its your favorite book. i hope you will like it!
Hope to see you soon!

Hello there! I'm at the Italian cock-fest, it is the biggest holiday here. I saw many great and impressive things already. People are having fun like fags and making the atmosphere of this holiday magic. I have seen the "dancing of passives" - a traditional dance performed by Roman artists and was really shocked by its high culture. People on the fest sang songs dressed in various colored costumes. Some circus artists showed interesting performance with fellatio playing their roles. There was also round dance and  pocket sluts that made the holiday even more funny. In general I am glad I visited this magnificent meeting and I hope I will do it again. Come and participate in this wonderful show, everyone!