It's a map puzzle. Teacher has to prepare the answer sheet before the activity. Just fill in the blanks as you like, or you could assign some advanced student to answer the questions or give the privilege of preparing the answer sheet to some student. Students need to ask teacher questions to get the information of the whole city map. EX: Ss: Where is the supermarket? T: It's next the the post office. Ss: Where is the post office? T: It's across the 7-11.