Please excuse me _______ your letter by mistake.
_____ is known to us all is that the old scientist, for _____ life was hard in the past, still works very hard in his eighties.
—_____?—Fine, I’ve got used to the life there, and I’ve made some friends.
You’d better give the task to _____ you think can finish it ahead of time.
I don’t think John saw me; he _____ into space.
As a writer _____ the new century, he is popular among the teenagers.