Which dr.are You?

Which dr.are You? which grade are you in Which school are you in? which country are you in? which side are you on? Which c_____ are you from? which grade are you in? Which class are you in? There are 26 letters in English.Which letter is a kind of dr Which school are you in?怎么回答? ----Which lesson are you studying now?---______ Which grade are you什么this year