the Children"s Place前加at还是in

the Children"s Place前加at还是in the summer 前加on还是in还是at in the place还是at the place(在这个地方） 是at the public place还是in the public place at place还是in place? children's day 前要不要加the 在具体时间前加on还是in还是at? the and of October前加at,in,of还是on 英语 我有些不明白the country前加at还是in?我有点不明白~ The park is a place where children can play in ( )A safe B s 词组,是ceremony前加at还是in ,on? trip前加什么介词是in on 还是 at