人去楼空

Regretful to say, when the master was absent, his mansion was dead.

人面兽心

He is cruel enought to kill that girl; he's really a wolf in sheep's clothing.

人言可畏

Opinion rules the world.

十年风水轮流转

Every dog has its day.

十全十美

The show just leaves nothing to be desired.

十拿九稳

We have winning the game in the bag.

十万火急 

I am writing in hot haste to let you know that I will be there ontime.

了无瓜葛

That politician claimed that he had nothing to do with that scandal.

力不从心

A:Can you do me a favor?
 B:Sorry, my spirit is willing, but my flesh is weak.

力挽狂澜

He tried to stem the tide, but in vain.