To ___ the puzzlement of the students, the teacher explained it once again to them.
Mr. Thomas is ______ a teacher to us. We look on him as our friend.
---Whose case is it? --- I’m not quite sure. But maybe it _______ Mr. White.
In order to by the education circle, he woks very hard.
It took more than twenty years for the great artist _the painting was finished completely.
Tom had no trouble at all the office building according to the note written by Mr. Smith.