【判断题】The challenge to Walmart in China mentioned by its CEO is China's big geography. In other words, among different cities, helping customers save money and serving them in a local way are challenging to...
【简答题】4. My friend Stuart
was born ( on / in / at ) December 31. In other
words, he was born ( in / on / at ) New
Year's Eve. Naturally he has a big party every year ( in / at / on )
his birthday!