Question

Mi father ____the Keys, so he can't open the door

Answer 1

Ответ:

my father lost the keys, so he can't open the door

мой папа потерял ключи, он не может открыть дверь

Answer 2

It seems like there's a missing word in your sentence. Based on the context, it seems you're trying to convey that your father lost or misplaced the keys. The completed sentence would be:

"My father lost the keys, so he can't open the door."