The chief reason for the population growth isn't so much a rise in birth rates ____________ a fall in death rates as a result of improvements in medical care.

单项选择题The Social Security Retirement Program is made up of two trust funds, ____________ could go penniless by next year.

单项选择题Although we feel dissatisfied with the election results, we have to become reconciled ____________ the decision made by our fellow countrymen.