1. He used to have an sloppy appearance. After several failed attempts to ask a girl out, he finally learned his lesson and cleaned up his appearance.2. The artist has a bohemian appearance and spends all his time painting.
 Not care how one looks sloppy appearance untidy appearance a bohemian appearancesloppy 很貼切，untidy 指不大整潔的外表，bohemian 是藝術家氣質的外表，也可說不修邊幅，並不會不整潔。
他之前往往不修邊幅, 後來經過多次跟女生約會失敗後總算學到教訓, 開始整理自己的儀容了< >
這是一個連環問題: 燃燒石油導致二氧化碳增加，二氧化碳增加導致溫室效應，溫室效應導致冰層融化、海平面上升。 (請填空)
This is a chain of problems. Burning oil leads to increase in carbon dioxide, which leads to the greenhouse effect, which leads to melting of glaciers, which leads to rising sea level.