Heis known to be faithful in the (perform) ________of his obligations.
查看答案
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.
She (possess) ________ of a wonderfully calm temperament.