by which year 和in which year

In which year did your parents_____ In which animal year were you born? I was born in 1972.是In which year were you born?还是Which year in which year were you born 还是 in which year are you born? A:Which month has____days in a year?B:February 求 In which year did Ireland become a self-governing country? 15.In which year did your parents _________? This is the house in which we lived last year Which month has ______ days in a year?---February. This year which team will win in the world cup? In which year did you start High School? Which ___of Nanjing did you live in last year?