CREATE TABLE table_30406 ("Season" TEXT, "Host" TEXT, "Mens Singles" TEXT, "Womens Singles" TEXT, "Mens Doubles" TEXT, "Womens Doubles" TEXT)

Who are all hosts when men's singles is Ma Wenge?
SELECT "Host" FROM table_30406 WHERE "Mens Singles" = 'Ma Wenge'
SELECT "Host" FROM "table_30406" WHERE "Mens Singles" = 'Ma Wenge'