Explanation:

‘By’ is not used with certain verbs while making a passive voice, instead we use at, with, in, to etc. They take fixed preposition after them that replaces ‘by’ . Surprise at/by, known to, amazed at, astonished at, startled at, vexed at, engulfed in, embodied in, contained in  annoyed with somebody, annoyed at something, decorated with, closed with, ornamented with, thronged with, tired of.