Determine the original term from which the following words were backformed. 确定下列逆构词最初的形式。 (a)asset (b)burgle (c)enthuse (d)greed (e)hush (f) automate (g)donate (h)escalate (i)homesick (j)peddle (k)diagnose (1)tuit (m)amusing (n)loaf (o)self-destruct (p)attrit (q)hairdress (r)emote (s)drowse (t)frivol