5. There is a strong resemblance between the man and the boy. They must be father and son.
(A) liking
(B) likelihood
(C) likewise
(D) likeness 

(A)liking：(n.)喜歡；愛好

to take a liking to sb./sth. 對某人／某物產生好感

to have/develop a liking for ... 喜愛／喜歡上…

(B) likelihood：(n.)可能性，可能

There is every likelihood that she'll come. 她極有可能來這兒。

Do you think there is any likelihood of his agreeing to it? 你覺得他有可能同意這件事嗎？

(C) likewise：(adv.)同樣地

同樣地，照樣地 : I told him to watch me and do likewise. 我叫他仔細看著我，並且照樣做。

也，亦，又 : To achieve this goal, you must have ambition; likewise you need to exert great efforts. 要實現這一目標，你必須有雄心壯志，同時還得十分努力。

(D) likeness：(n.)相像，相似（+between/to） 複:likenesses

I see no likeness whatever between him and his brother. 我看不出他和他兄弟有任何相似之處。

資料來源 : yahoo字典