Most of the time, he has no trouble ______________ the people from different countries.

针对韩国军方与乐天集团签署部署反导弹系统换地协议一事，不少中国民众呼吁抵制乐天，商务部新闻发言人孙继文3月2日也表示，美韩的行动严重损害中国的战略安全利益，也损害了中韩合作的民意基础，中方对此坚决反对。对民众抵制乐天的行为认识错误的是（    ）

根据句意及汉语提示完成单词

①Could you please ____ (发送) a postcard to me when you're in Sydney?

② There used to be lots of sandstorms in Beijing years ____ (以前).

③Our country is paying more attention to people's ____ (健康).

④ More and more ____ (西方的) people are interested in Chinese doctors.

⑤If You Are the One(《非诚勿扰》) is one of the most popular ____ (节目) on TV now.

如果关于x的一元二次方程kx²﹣$\sqrt{2k+1}$x+1=0有两个不相等的实数根，那么k的取值范围是____