Thinking you know in fact you don’t know is a terrible mistake.
As you know, it is our duty to _________ my younger sisters from being hurt when they are in trouble.
According to the investigation, the D-train accident resulted from the fact that the authorities concerned didn’t _________ enough importance to the safety of the signal equipment.
—How about going out for a break?— . We've been working for three hours.
It was announced that only when the terrible disease was under control _____ to return to their homes.
Spelling Bee is a contest _____ competitors, usually children, are asked to spell as many words as possible.