As an employee, I couldn’t help but ______ still for hours as the boss told me to.
Don’t forget the day ____ you were received into the Youth League.
I’ve finished writing the novel, ____ is to be published next month.
He returned home safe and sound after a fierce battle, ____ was unexpected.
____ we is known to all, English is not very difficult to learn.
The old man had three sons, all of ____ died during World War Ⅱ.