Problem: Which Swiss national is a leading tennis player?
======
A: roger federer

Problem: Leo Joseph Ryan Jr., the first US congressman to be killed in the line of duty, was murdered where?
======
A: guyana

Problem: What is the more common name for a lexicon, of which Dr. Johnson's is an early example?
======
A: dictionary

Problem: To within 1 year either side, in which year did the half crown cease to be legal tender in the U
======
A:
1970