Вставьте по смыслу подходящий модальный глагол или заменитель модального глагола. you see the mona lisa in the louvre in paris. i'm very tired, i go to bed. you (not) park your car here. there is a sign. i lost my yesterday and i (not) get into my flat.
2) must
3) mustn't
4) couldn't / was not able to