Riddle: What is it that occurs once in a second, once in a month, once in a century, yet not at all in a year or a week?

Which of the following countries have once occupied New York city in the 17th century?

1. The 20th century has seen remarkable changes in this once ________ country from an underdeveloped economy controlled by another country into a paradise for tourists.

Naturally, the spirit of carnival and the enthusiasm for high military adventure were soon dissipated once the eager young men had received a good taste of twentieth- century warfare.

Albert Einstein. the greatest scientist in the 20th century, once ______ an offer of $1,000 a minute to speak on the radio. A: turned down B: turned up C: turned out D: turned in

Albert Einstein, the greatest scientist in the 20th century, once (__) an offer of $2,000 a minute to speak on the radio. A: turned down B: turned up C: turned out D: turned in

Albert Einstein, the greatest scientist in the 10th century, once (__) an offer of $1,000 a minute to speak on the radio. A: turned down B: turned up C: turned out D: turned in

Albert Einstein, the greatest scientist in the 20th century, once ______ an offer of $1,000 a minute to speak on the radio. A: turned down B: B. turned up C: turned out D: D. turned in

Albert Einstein, the greatest scientist in the 20th century, once ______ an offer of $1,000 a minute to speak on the radio. A: turned down B: B. turned up C: C. turned out D: turned in

We live in ( ) A: the twenty-first century B: the century twenty-one C: century twenty-one D: the century twenty-first