It’s quite_____me why such things have been allowed to happen.
—Which one of these two dictionaries do you advise me to buy, Oxford or Longman?—Well, take Oxford. I think it is the ________ of the two.
Nothing that you say can change his mind, ________?
The smoggy weather has made us realize ________ terrible problems we are faced with.
—How unhappy your roommate looks!—Yes, but he's not willing to tell me what it is ________ is troubling him.
When the millionaire was young, he was very poor. Only by doing parttime jobs during the summer holiday ________ afford to pay his college fees.