1. _____ all our kindness to help her, Sara refused to listen.
2. ____ before we depart the day after tomorrow, we should have a wonderful dinner party.
A. Had they arrived
B. Would they arrive
C. Were they arriving
D. Were they to arrive
3. ____ conflict among city-states caused the eventual decline of Greek civilization.
4. ____ he's already heard the news.
A. Chances are
B. Chance is
C. Opportunities are
D. Opportunity is