1. I still cannot get over the fact that my ex is dating the President of the U.S.2. I cannot imagine how he managed to solve this incredibly difficult problem.
 cannot get over the fact that... cannot imagine that...
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 roblems. 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.