2.pun: the clever or humorous use of a word that has more than one meaning, or of words that have different meanings but sound the same 雙關語 ~ (on sth)
We're banking on them lending us the money─no pun intended! 我們正指望他們借給我們錢呢 bank 絕無雙關之意!

3.Delighted: very pleased 高興的;愉快的;快樂的 adjective ~ (to do sth) ~ (that…) ~ (by/at/with sth)
a delighted smile 愉快的微笑
I'd be absolutely delighted to come. 我非常樂意前來.
I was delighted that you could stay. 你能留下來我很高興.
She was delighted by/at the news of the wedding. 聽到婚禮的消息她很高興.
I was delighted with my presents. 我對我收到的禮物很滿意.

4.Credit: praise or approval because you are responsible for something good that has happened 贊揚;稱贊;認可 uncountable ~ (for sth)
He's a player who rarely seems to get the credit he deserves. 他這個選手好像很少得到應得的贊揚.
I can't take all the credit for the show's success─it was a team effort. 演出成功不能都算成我一個人的功勞,這是集體努力的結果.
We did all the work and she gets all the credit! 工作都是我們干的,而功勞卻都歸了她!
Credit will be given in the exam for good spelling and grammar. 考試中拼寫和語法出色者將受到表揚.
At least give him credit for trying(= praise him because he tried, even if he did not succeed). 至少該表揚他嘗試過.