-Are you sure you have to? It’s been very late.-I don’t know ________ I can do it if not now.
—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.
Kate had a terrible time this summer. Not a day ________ without having some unpleasantness with her sister at home.