be strict in ， in 后加事物

如：We should be strict in (doing) our work.
  对工作我们应该严格要求。

而be strict with， with 后 加人

如；His father is strict with him
    他父亲对他严格要求。 

My parents are very strict with me.
  

Don't be so strict with yourself
 

 The teacher is strict with his  students
  

Our boss is very strict with us.
  

I'm strict with myself.

The manager is strict in his work.
 

 He is strict in his money.
 

 The students are strict in discipline.
 

 The goverment is strict in enviromental protection.
 

 The teacher is strict in moral education.

My teacher is always strict with us.
我的老师对我们总是很严格。

We must be strict about this problem.
我们必须严肃对待这个问题。