________ is known to us all is that the old worker, for _______ life was hard in the past, still works hard in his seventies.
_____ it rain tomorrow, we would have to _______ the picnic.
-- Do you mind if I keep pets in this building? --- ___________.
It is very important that you _______ for this examination.
The car accident on the main road the other day ________ the careless driving of a driver.
The poem did not have an appropriate ending, _________ she would have won the competition.