CREATE TABLE table_28138035_35 (year_location VARCHAR, mens_singles VARCHAR)

In what year and location did Liu Guozheng win the Mens Singles?
SELECT year_location FROM table_28138035_35 WHERE mens_singles = "Liu Guozheng"
SELECT "year_location" FROM "table_28138035_35" WHERE "Liu Guozheng" = "mens_singles"