---The last one __________________ pays the meal. ---Agreed!
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.
So quickly ________ is a possibility today may be a reality tomorrow.
The Chinese government promised that under no circumstances ________ the efforts to provide universal and lowcost health care.