.We can never expect _________ bluer sky unless we create _________ less polluted world.
_______ on rescuing her sick son, the poor mother has been working 16 hours a day.
_______, I lost heart in English learning, but my teacher said to me, “Keep on working hard, and you’ll succeed ________.”
_______ for the doctor’s careful treatment, he _______ till last year.
The performance of the host, _________ to please the audience and draw their attention, was greeted with a cold silence, however.
Ruth sold most of her belongings. She has hardly_________ left in her house.