He is the (own) ________of the house, but he lives in another city.
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Heis known to be faithful in the (perform) ________of his obligations.
This is a private gardent, so no one can go in without (permissible) ________.
Even now there are still some natural (phenomenon) ________ can not e explained.
There is a lot of (pollute) ________in the air, because a chemical factory is near here.