[jī]
[代]
（他[她，它]的； 他[她，它]们的） his [her, its, their]
his father
其父
make the best possible use of everything
物尽其用
Each is in his proper place.; Everyone is properly provided for.
各得其所。
Everyone does his best.
各尽其力。
（他， 她， 它； 他 [她， 它]们） he, she, it, they
help (to) bring it about at an early date
促其早日实现
He [She] is not allowed to commit any outrages.
不能任其胡作非为。
Don't let things slide.
不要任其自流。
（自己； 自己的） oneself
support oneself by one's own labour; earn one's own living
自食其力
（那个； 那样） that; such
not mind taking all the trouble
不厌其烦
(so vividly described that) you seem to see and hear the person
如闻其声， 如见其人
just at that time; at the opportune moment
正当其时
There is no lack of such people.
不乏其人。
It is found that there was no such thing.
查无其事。
（姓氏） a surname
Qi Shi
其石