Based on the clue 'according to proverbs a merry one of these doeth g...', what is the answer?

Based on the clue 'according to playwright william congreve you must ...', what is the answer? Based on the clue 'according to plutarch in the 300s bc persian king ...', what is the answer? Based on the clue 'according to popular legend a hit song by the iri...', what is the answer? What is associated with: according to projections china will be passed in population by this country by the year 2050? Based on the clue 'according to proverbs he that troubleth his own ho...', what is the answer? Based on the clue 'according to psalm 111 the fear of this is the be...', what is the answer? Based on the clue 'according to psychoanalytic theory its part of the...', what is the answer? Based on the clue 'according to pythagoras it was harmonious made by ...', what is the answer?