What is the meaning of “the parts he left out are what changed my life? ”

Hey guys! i've got an exercise where you've to find out the correct sentence in each pair. 1) a-we were tired and thirsty, so we stopped to have a drink at the cafè. b-we were tired and thirsty, so we stopped having a drink at the cafè. 2)a-if your computer freezes, try to turn it on and off again and see if that . b-if you computer freezes try turning it on and off again and see if that . me! it's urgent!

Read the excerpt from it's our world, too! : young people who are making a difference.the author’s purpose in this excerpt is to

Imagine that you have just moved to a new city.write a short letter to your best friendtelling him or her about the move.be sure to include the date and your new address.use additional paper ifnecessary