阅读文言文，回答问题
山不在高，有仙则名。水不在深，有龙则灵。斯是陋室，惟吾德馨。……，……。谈笑有鸿儒，往来无白丁。可以调素琴，阅金经。无丝竹之乱耳，无案牍之劳形。南阳诸葛庐，西蜀子云亭。孔子云：何陋之有？
—All the workers went home yesterday ___________ Mr. White. Why?
—Because he was on duty.
沙漠中的沙丘形成的主要原因有 ( )
— I know they practiced a lot.
