Have a field day:
過(guò)著(zhe)田野的日子 ×
特别痛快，特别過(guò)瘾 √
例句：
We had a field day at the amusement park.
全家老小在遊樂場(chǎng)裏玩得十分盡(jǐn)興。
To give one's best shot:
發揮出某人最好的水平
例句：
He will give it his best shot in the match.
他會在比賽中努力發(fā)揮(huī)出自己最好的水平。
For a song:
爲(wèi)瞭(le)一首歌 ×
買瞭(le)便宜貨(huò) √
例句 ：
You picked it up for a song.
你真是買到便宜貨。
Assignment
