购物者在排队等候结账时，会很容易受诱惑去买结账台旁架子上的口香糖或其他小件商品。

Sentence No. 1 Walking is a skill people learn as babies. But, it is not as simple as that. Every year, some 15 thousand American pedestrians are killed by motor vehicles.

Sentence No. 2 When shoppers are waiting in the checkout line, they can be easily tempted to buy chewing gums, and other small items on the racks next to the checkout counter.