Thousands of years ago people discovered the phenomenon by chance, and this was _____ the idea of the compass first came from.
My boss hates interruptions,when he is trying to work.
Mother always tells me to believe in myself, ____ that nothing is too difficult to a willing heart.
In order to understand the____ of the animal, she spent many years recording its daily activities.
Only after the woman had her own child ___ how difficult it was to be a mother.
I would appreciate ________ much if you could write to me as soon as possible.