13. Let's sing a duet.
来个二重唱吧。
还能这样说：
Let's sing in duet.
Let's sing together.
14. What's your karaoke specialty?
你唱卡拉OK有什么拿手的歌吗？
还能这样说：
What's your best song?
Which songs do you sing the best?
应用解析：
special court 特别法庭；
a special train 专车，临时列车；
special to 对……特别的；
make a special study of 专修，专攻
15. I dare not to sing in front of people.
我不敢在大家面前唱歌。
还能这样说：
I dare not to sing publicly.
I have no courage to sing in public.
应用解析：
out front 在观众席中；
a front for sth. 非法或秘密活动的隐蔽物；
front-page 头版新闻；
front runner 最有可能成功或胜利的人，领先者
16. I can't keep up with the new songs.
我跟不上新歌的速度。
还能这样说：
I can't keep track of the new music.
I can't learn the new songs fast enough.
应用解析：
keep up with the Joneses 赶时髦，与他人攀比；
keep time 合拍子；及时；
keep watch 留意，注意，守望；
for keeps 永远地，永久地；
keep after 紧紧追赶；
keep away 使离开，避开
17. It was the most beautiful song I had ever heard.
那歌声是我所听过的最优美的歌曲。
还能这样说：
I had never heard a more beautiful song than this one.
Among all the songs which I had heard, this one was the best.