Watch the video clip and then choose the best answer to complete the sentences. desirable a. 值得向往的;富有魅力的 beneficial a. 有益的;有利的 personal value 个人价值 strive for 努力;奋斗 complex a. 复杂的 survival n. 幸存;生存 caregiver n. 看护人,护理者 interact v. 互动;互相影响 unsocial a. 不合群的;孤僻的 u5pBsB.wmv