Only then ___________ to answer violence with violence.
There was ______ time ______ I hated to go to school .
He made another wonderful discovery, ______ of great importance to science.
When they met again, the two friends talked about lots of things and persons ______.we could remember in the school.
The factory ______ I am going to is the place ______ my mother used to work many years ago.
Who can p what life will be like in the future?