[答案]C. occasion

　　[注释] occasion 作可数名词时，意为“时机”，作不可数名词时，意为“必要”，本题中occasion 意为“必要”。从句语法结构上看，本句中用opportunity(难得的)机会，chance(偶然的)机会均可，但按逻辑意思，应用occasion.

　　[答案]D. point.

　　[注释]point(=chief idea of sth. said, done, or planned)要点;论点，主旨：I don't see your point.(我不明白你的意思。)He said nothing to the point.(他说的不切题。)

　　[答案]D. policy.

　　[注释]policy(尤指政党、政府、大企业、商行等的)政策，方针。Campaign(政治或竞选的)运动;(军事的)行动，procedure 做事的手续、程序，rule 规则，plan 计划，均不合题意。

　　本题译文：本公司的一贯方针是鼓励工人参加社会活动。

　　[答案]D. realised.

　　[注释]realise sth. by doing sth. else 通过做......来实现.......。

　　[答案]A. recall.

　　[注释]recall(=bring back to the mind)想起，回忆起：But I really cann't recall your name at his moment.Remind sb. of ...使......想起：1)The photo reminds me of my late father.(这张照片使我想起已故的父亲。) 2)The sight of the clock reminded me that I was late.Remind sb. to sth.提醒......做......;Please remind me to write the letter.