Complete each of the following sentences with a word derived from the one given in the bracket.
How nice it is to （ ）that clear mountain air! (breath)
【正确答案】：BREATHE
【题目解析】：
本题考查的是常用名词的动词。
由to可知空缺处应填动词构成不定式，breath的动词是breathe意为“呼吸”。此处为how引导的感叹句。
句意：呼吸那清新的山间空气真是太好了！