forever, for good, eternally / indefinitely / for as long as one likes

入電: the receipt of a telegram

comb down one's hair / smooth out wrinkles in clothes etc.

at all costs, whatever it takes

by all means, absolutely must, one way or another

that's so, isn't it so? / hmm (used to indicate that the listener has heard and understood) / well (as a filler word particularly at the beginning of a response to a question)

even if not

It would be good if~

auspicious / celebratory / joyful

to be able to get by without doing something