I worked my way through college so I can pay off my mortgage and help my family financially.
work one's way through半工半讀 = work one's way through我半工半讀完成大學學業 = work my way through college/university
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 probems. 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 levels.