I failed to watch the TV program on account of a power failure.
fail to do 「～できない」
on account of ~ = because of ~ = owing to~ = due to~ 「～のために」
Keep the heater running lest you should catch cold.
keep + objective + ing 「～を―ままにしておく」
lest + man + should +Verb 「人が～しないように」
He came to believe the rumor to be true.
came to~ 「～するようになる」
to begin with 「まず」
anything but ~ = far from ~ 「決して～ない」
The meeting is to be held next Sunday.
be + to Verb 予定・義務・可能などを表す。
care for = like 「好む」
What ~ for? = Why ~? 「何のために、なぜ」
I intended to have called him right away.
intended to have + pp = meant to have + pp
「～す￥るつもりだったのだが（しなかった）」
have nothing to do with ~ 「～と関係がない」
free from ~ 「～がない」
look down on ~ = despise ~ 「～を軽蔑する」