.There’s no _____ from my bedroom window except fro some factory chimneys.
—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.
The warning we were given as children ________ an apple a day keeps the doctor away may,in fact,have a scientific explanation.