Tear is to sorrow as smile is to <u>joy</u> or <u>happiness</u>.
To tear usually means to be sad, or have sorrow. Smiling is an expression of happiness or joy.
Hope this helped :) <-- Joy :P
Wallace places emphasis on the word "adjust" because he is addressing our realities and way of thinking as "default." He expresses the importance of paying attention to your surroundings, and adjusting to other perspectives and ways of thinking. He compares our ignored experiences to the water fish swim in but were never taught to notice.
It is Burned add ed for past tense
