题目内容：

阅读下面材料，在空白处填入适当的内容（1个单词）或括号内单词的正确形式

It seems that Chinese people have always loved to discuss 1. differences between northerners and southerners. Now, another difference has drawn wide attention: the way northerners and southerners shop for food at markets.

People from southern China normally buy 2. they need for just one or two meals at a time. It’s normal for them to buy just half a Chinese cabbage, two 3.（potato）and 25 grams of beef at a time, 4.. a person may be laughed at if they do this in the north. Instead, buying enough vegetables and meat for a week 5.（be）normal.

The difference could be because 6.the different climates. Food can 7.（keep）for a long time in the north, as it’s 8.（usual）cold and dry there. Many northerners have the habit of 9.（store）food for a long time. But due to the hot and wet weather in the south, southern Chinese people prefer 10.（buy）just enough food for one meal or one day. Otherwise, the food may go bad.

Maybe these debates about different customs help us to understand each other better.