It’s time to take the teacher-scored Mid-Unit Assessment. Save the Mid-Unit Assessment to your computer with the correct unit name, unit number, lesson number, and your name at the end of the file name (e. g., Cells_Unit_Test_U1L4_Alice_Jones. doc). When you have finished, use the Dropbox tool to submit your completed Mid-Unit Test to your teacher. 1. Give two geographic reasons why cities grew up on rivers.