依次填入下面横线处的句子，衔接最恰当的一项是（ ）　　　　。　　　　。　　　　，　　　　：　　　　，　　　　。周敦颐曾论证过，衡湘以南为进士者，皆以子厚为师。唐朝时湖南有25人考取了进士，永州就有9人，柳子功莫大焉。①一个历史上著名的奸臣竟对柳子有这样的礼赞②震惊之余，也颇释然③在永州潇水之西的柳子庙内的一块古碑上有一首诗，名为“寻愚溪谒柳子庙”④理应得到所有人的敬仰⑤诗的落款刻的是“严嵩”二字⑥以柳宗元谪守永州而坚贞如玉的品格操守、才冠古今的文章学识

It is said that there ______ a concert this Saturday. Do you want to go? [ ]

“The children are playing in the park.”The main structure of the sentence is ______ .

______children whose parents had died in the earthquake ____ sent to live with families in other cities.

I found ________ difficult to make friends with him because he is very shy.