It’s good to see you again.—Yes. I keep all the letters __________ you wrote to me over the years.

It’s dangerous to let the children who are _____ go swimming in the river

Different festivals are ________ in different parts and countries every year.

33_________ in some rural schools that the teacher is even unable to walk through the rows of desks

依次填入下列各句横线处的成语，最恰当的一组是 （ ）①2015年斯诺克中国公开赛半决赛结束后，丁俊晖接受了记者采访。一向给人青涩腼腆印象的小丁，此次面对媒体提问却 ，显得成熟自信。②《可惜无声》是齐白石1942年创作的一套书画册页，题名“可惜无声”意指画中草虫形态逼真， ，实不输于真实世界的草虫，只可惜无声。③爱国主义教育是一项基础性的工程，推进中小学生的爱国主义教育需要文火熬粥的“慢功夫”，要少一些急功近利的灌输，多一些 的滋润。