Complete each of the following sentences with a (compound) word derived from the one(s) given in brackets.
I believe that fresh air is （ ） to your health. (benefit)
【正确答案】：BENEFICIAL
【题目解析】：
本题考查的是常见动词的形容词形式。
由is可知，空缺处应填形容词作表语，benefit的形容词形式是beneficial意为“对...有益的”。
句意：我相信新鲜空气对你的健康是有益的。