I am a good student, and I don't associate with bad students. or I am a good student, and I don't follow bad examples of bad students.
 associate with somebody; get involved with somebody follow bad examples指跟很多壞人一起做壞事. 指學別人做壞事.
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 risin sea levels.