People think “SOS” is the simplest and common to make, in time of danger or disaster.
Is this the watch you wish to _____?
These are questions ______ by history.
___that she’s by law old enough to get married, I don’t see how you can stop her.
He bought some books, ______ were expensive.
The city was difficult ________, _________ was defended by an army of 6,000 men.