Let's make five different sentences with the word happy. 

Joy to Our World

I am happy! 

如鱼得水[rú yú dé shuǐ]：like/fish/get/water；as fish getting to the water
This idiom is used to signify finding a boon companion or an ideal situation.
东汉末年 dōng hàn mò nián：In the late Eastern Han Dynasty
诸葛亮zhū gě liàng ：a statesman and strategist, prime minister of the Kingdom of Shu in the period of the Three Kingdoms.
刘备 liú bèi ：the founder of Han kingdom in the Three Kingdoms.
关羽 guān yǔ ：a general allied to Liu Bei, deified as God of War.
张飞 zhāng fēi：a general of the Three Kingdoms.
军师 jūn shī：military counsellor；
指点 zhǐ diǎn：give advice (directions);show how to do sth.
形势 xíng shì：situation；condition
提高tí gāo：improve；raise；increase
亲密 qīn mì：close； intimate:
服气 fú qì：be convinced
例如：在这个工作环境中，他如鱼得水，非常享受工作。
           zài zhè gè gōng zuò huán jìng zhōng,tā rú yú dé shuǐ,fēi cháng xiǎng shòu gōngzuò 。
           在游泳池里，他如鱼得水，游得非常快乐。
           zài yóu yǒng chí lǐ,tā rú yú dé shuǐ, yóu de fēi cháng kuàilè 。

乐读中文 (Lè Dú Zhōngwén) - "Joyful Chinese Stories"

如鱼得水 [rú yú dé shuǐ]

画龙点睛 [huà lóng diǎn jīng]：draw;paint/loong/touch lightly /eyes；
The idiom means bringing the painted dragon to life by putting in the pupils of its eyes,and it  emphasizes the critical adjustment or embellishment made after completing a task to achieve the best possible outcome.
南北朝 nán běi cháo：The Northern and Southern Dynasties in Chinese history
画家 huà jiā：painter
张僧繇 zhāng sēng yáo：A famous ancient painters
寺庙 sì miào：temple
墙壁 qiáng bì：wall
说大话 shuō dà huà：brag；boast；talk big
顿时 dùn shí：suddenly；at once
电闪雷鸣 diàn shǎn léi míng：the lightning flashed and thunder crashed
腾空 téng kōng：rise high into the air; soar

画龙点睛 [huà lóng diǎn jīng]

对牛弹琴[duì niú tán qín]：to;towards/cattle;ox/play/lute
 The idiom means taking to someone and expecting them to care or do something instead the other person just stands there and is not responding to you.
公明仪 gōng míng yí：a person‘s name in Ancient 
出游 chū yóu：Travel; go on a tour
清澈 qīng chè：Limpid; clear
景色 jǐng sè：scenery; view; scene
兴致大发 xìng zhì dà fā：interest ; mood
尽管 jǐn guǎn：although;while;when
动人 dòng rén ：moving；touching


对牛弹琴[duì niú tán qín]

得过且过[dé guò qiě guò]：get/pass by/for the moment/pass by. 
五台山 wǔ tái shān：Mount Wutai in China
寒号鸟 hán háo niǎo：A kind of bird
浑身 hún shēn：all over;from head to foot
羽毛 yǔ máo：plume;feather
得意地 dé yì de ：proudly
凤凰 fèng huáng：a Chinese phoenix
不如 bù rú：not as good as
搭窝 dā wō：build a nest
脱落 tuō luò：drop;fall off;come off;shed
无可奈何 wú kě nài hé：helpless; against one's will
哀号 āi háo：cry piteously; wail
This idiom means to get on in a haphazard way with no clear plan and if it can pass then pass it.
eg：如果我们不努力工作，得过且过，总有一天会后悔的。
       rúguǒ wǒmen bù nǔlì gōngzuò,dé guò qiě guò,zǒngyǒu yī tiān huì hòuhuǐ de.

得过且过[dé guò qiě guò]

胸有成竹[xiōng yǒu chéng zhú]：chest;mind/has/become/bamboo；to have a well-thought-out plan；have a preconceived idea at heart; have a well-thought-out plan beforehand;
eg：他对明天的考试胸有成竹。 tā duì míngtiān de kǎoshì xiōng yǒu chéng zhú。
         我的朋友总是胸有成竹。wǒ de péngyou zǒngshì xiōng yǒu chéng zhú 。
宋朝 sòng cháo：Song dynasty
文与可 wén yǔ kě：the name of a person
画家 huà jiā：painter; artist
房前屋后 fàng qián wū hòu：In front and behind the house
形态 xíng tài：form;shape;pattern
生动 shēng dòng：vivid;lively
逼真 bī zhēn：lifelike;true to life
形象 xíng xiàng：image;form;figure

胸有成竹[xiōng yǒu chéng zhú]

哄堂大笑[hōng táng dà xiào]：roar/house/big/laugh；The people of the whole house burst out [into] laughter.
唐朝 táng cháo：Tang Dynasty.
冯相 féng xiàng: the name of a person
官员 guān yuán：Government official
靴子 xuē zi：boots
同僚 tóng liáo：associate;colleague;fellow-officials
惊奇 jīng qí：wonder; be surprised



哄堂大笑[hōng táng dà xiào]

专心致志[zhuān xīn zhì zhì]：focus on/heart/devote/heart；
to devote oneself heart and soul to or to give complete attention to 
eg：她专心致志地学习中文 tā zhuān xīn zhì zhì de xuéxí hànyǔ。
        爸爸专心致志地看报纸 bàba zhuān xīn zhì zhì de kàn bàozhǐ 。
鲁国 lǔ guó：Lu state in the Spring and Autumn period in Chinese history.
弈秋 yì qiū：The name of a person
围棋 wéi qí：Go;Chinese draught
高手 gāo shǒu：Past master master-hand ace
徒弟 tú dì：apprentice;disciple;pupil
棋艺 qí yì：skill
大雁 dà yàn：wild goose
丝毫 sī háo：a bit;in the least

专心致志[zhuān xīn zhì zhì]

笨鸟先飞[bèn niǎo xiān fēi]：clumsy/bird/first/fly, Clumsy birds have to start flying early .
灵活 líng huó：quick; clever
嘲笑 cháo xiào：laugh at
懒惰 lǎn duò：lazy
气馁 qì něi：be discouraged lose heart
飞翔 fēi xiáng：fly; flight; hover
坚持不懈 jiān chí bù xiè：hold on consistently and persistently
尝试 cháng shì：try;attempt;trail
掌握 zhǎng wò：grasp; master; know well
技巧 jì qiǎo：skill;technic
顺利 shùn lì：smoothly;successfully
出色 chū sè：outstanding;remarkable
The idioms means to be successful you have to keep one step ahead other people.
