be due to

由于,因为

be concerned about, be concerned with, be confronted with, be connected to, be conscious of, be considerate of, be considerate of..., be content with, be contrary to, be convinced that, be covered with, be crazy about, be deep in thought, be deserving of, be detached from, be different from, be disagreeable to, be disgusted with, be doubled up, be due, be eager for sth., be eager to, be envious of, be equal to, be essential to, be exposed to, be faced with, be familiar to, be familiar with, be far from, be favourable to, be fed up, be fed up (with ), be fed up with, be filled with, be fit for, be fond of, be free from, be friends with, be full of,