The old tower must be saved, _______ the cost.
She wrote a letter to her father, ___ she made her secret known.
The factory ___ I am going to is the place ___ my mother used to work many years ago.
The last river __ _ they crossed is two miles wide.
This is one of the means ____t he electic energy is conducted from one place to another.
The buses, ____were already full, were surrounded by an angry crowd.