Knowing her son was out of danger, the mother sighed _________ relief.
______ Mid Autumn Festival of this year falls on______ Saturday.
We must take measures to protect the environment from ______.
I was just _______to go out when the telephone rang .
Doing morning exercises _______ our health and we _______ it.
He has been doing the job for many years, but has never felt ________ it, though his workmates think it is a ________ one.