【推荐1】To his parents’ ________ (relieve), the boy finally realized the importance of study. （所给词的适当形式填空）

【推荐2】—Don’t worry, Mum. The doctor said it was only the flu.
—What a _______(relieve)! I’ll tell your dad there’s nothing serious. (所给词的适当形式填空)

【推荐3】No one was hurt, and we all breathed a sigh of________ (relieve). (所给词的适当形式填空)

【推荐1】The rules are there to ensure everyone’s safety and_______(enjoy). (所给词的适当形式填空)

【推荐2】You should phone his secretary if you want to make an _______(appoint).(所给词的适当形式填空)

【推荐3】He enjoyed the _________(flexible) of his working arrangement. (所给词的适当形式填空)

【推荐1】The internet is an invention that I cannot live without as I use it every day for study, fun and ____________ (communicate). (所给词的适当形式填空)

【推荐2】They were frightened to ________ (die) after the car accident. (所给词的适当形式填空)

【推荐3】Cao and Wu also collected garbage along the road, in order to promote environmental ________ (protect). Cao believes this will make the hiking trip even more ________ (meaning). The two of them collected more than 1,000 plastic bottles along the 40-day journey. （所给词的适当形式填空）