【正文】
Useful expressions ? pack sth onto a wagon ? leave behind ? set off for ? choose… as ? by day ? form a circle ? the most trying part ? pass through the desert ? be hard on ? ride the wagon ? drag one’s legs ? in desperate need of ? share sth with sb ? be on one’s feet ? be accustomed to doing sth ? suffer from ? be lined with ? in anxiety of doing sth ? in most cases ? get onto one’s knees Read the text carefully and find out their moving route . Spring of 1845 set off started from Kansas Many weeks later reached the edge