In those days, books could only be produced one at a time by hand. __________, they were expensive and rare.
—Who is that young man ____? —He’s Jack, my brother.
—You’re thirsty(口渴). ____ have a glass of milk? —Good idea.
—Is Mr. Brown a good teacher? —Yes. He is kind ____ us. We love him.
—Is this a photo ____ your family? —Yes, it is.
—What does your father do?—____