Don't be cocky. I'll win it back.
别太骄傲，我会赢回来的。cocky['kɒkɪ]adj. 自大的；骄傲的；过于自信的
[ 比较级 cockier 最高级 cockiest ]

An investigation is underway.
事件正在调查中。underway['ʌndə'weɪ] adj. 进行中的

on the air
Hurry up! The program is on the air. I don't want to miss it.
赶紧的！节目正在播出呢，我可不想错过。

Please don't push me. I really don't feel like apologizing.
别逼我好吧，我真心不想道歉。push[pʊʃ] vt.对…施加压力，逼迫

Let's go on a shopping spree to discount stores here.
我们去打折店疯狂扫货吧。shopping spree疯狂购物，扫货

If you need any help,just let me know. You know I have your back.
需要帮忙尽管说，你知道我是力挺你的。have your back力挺你，支持你

For me, Friends is the best sitcom ever.
我觉得《老友记》是史上最棒的情景喜剧。sitcom['sɪtkɒm]abbr. 情景喜剧（situation comedy）

online dating
It's not easy to find your Mr. Right through online dating.
想通过网上约会找到意中人，可并不容易