Crossing over mountains and passing by rivers,a group of Laotian （老挝的） children arrived in China on the China-Laos railway train.
This is the cultural （文化的） journey recorded in the documentary （纪录片） The Memory of All the Blissful Moments.These Laotian children traveled to different Chinese cities and had close exchanges（交流） with Chinese students over the summer.
In Beijing,Sousongpha,a 10-year-old girl from Laos,climbed the Great Wall and enjoyed the wonders she imagined.12-year-old Geota stood on the stage in China for the first time to show Laotian culture.
12-year-old Peilingda ①______ Chinese learning at the age of 3 and became interested in Chinese songs.She felt that her dream started as she first ran happily by the sea in Xiamen.
In Xi\’an,12-year-old Pasougan had the chance to create a copy of the Terracotta Warriors（兵马俑） and experience Chinese traditional culture.②"I feel time is passing quickly,like a dream.If you ask me what color this dream is,my answer is orange,since my favorite color is orange,"Pasougan said in the documentary.
③The China-Laos railway not only links the two countries,but also promotes（增进） friendship and carries dreams.With it,children in Laos are getting closer to the outside world.

（1）How did the Laotian children in the documentary come to China? ______
（2）When did these children travel to China? ______
（3）Complete sentence ①.（补全①句,使文意通顺、正确.） ______
（4）What\’s the function of Sentence ②in the paragraph?（用英语写出②句在文段中的作用.） ______
（5）What does the underlined word"links"mean in Sentence in English? ______