Such exchange students________have a good knowledge of English will not worry about their daily life in America.
It was _____ the old clock that the old man spent the whole morning at home.
_____ what the six blind men said sounded!
How pleased the boy was _____ what his parents said!
Was it _____ she heard with her ears _____ really made her frightened?
Is this factory _____ you visited the other day?