1. The supermarket has five checkouts.2. The supermarket has five checkout counters.3. A lady was mugged when she was standing in the checkout line at the supermarket.
 checkout counter checkout這裡指的是商店裡的付帳的地方。checkout line = 為了付帳而排的隊
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 meting of glaciers, which leads to rising sea levels.