_________ environmental damage is done, it takes many years for the ecosystem to recover.
I called Hannah many times yesterday evening, but I couldn’t get through. Her brother ________ on the phone all the time!
But for their help, we ________ the program in time.
In peace, too, the Red Cross is expected to send help ________ there is human suffering.
In just a decade, the company has been ________ from a family business to a large operation.
The folk song concert was so well _______ that all the tickets had been sold out on the first day.