This new kind of chemicals will help keep the air, soil and water________ from pollution.
If it were not for the fact that she __________ sing, I would invite her to the party.
— What’s the name? — Khulaifi. __________ I spell that for you?
— I think I’ll give Bob a ring. — You __________. You haven’t been in touch with him for ages.
We __________ have proved great adventurers, but we have done the greatest march ever made in the past ten years.
George couldn’t remember when he first met Mr. Anderson, but he was sure it was __________ Sunday because everybody was at __________ church.