If you miss the class due to illness, you can take a make-up class within a week.
take a make-up class補課 = take a make-up class注意，別說 take a makeup class，會令人誤解為化妝課程
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 efect, which leads to melting of glaciers, which leads to rising sea levels.