17.If Tom finds a favourite song, he may want to hear it over and over again to the point_________everyone else is sick of it!
—Mary,turn the heat down,________ burn. —OK.Mum.
Seldom ________ TV when he studied in senior high school.
Everything,unless otherwise ________,will go on as planned.
—It's a pity that Andrew didn't want to go to the conference. —________ willing to go,we could have paid all his expenses.
—Why do you look so puzzled? —Oh,I ________ over a most difficult maths problem.