What you cannot hold but it is yours?

What does this rebus riddle means ?

I have teeth but i don't bite. Who Am I ?

No matter how little or how much you use me, you change me every month. What am I?

A man desired to get into his work building, however he had forgotten his code.
However, he did recollect five pieces of information
* Fifth number + Third number = 14
* The fourth number is one more than the second number.
* The first number is one less than twice the second number.
* The second number and the third number equals 10.
* The sum of all five numbers is 30.

What is the code ?

What is black when you buy it, red when you use it, and gray when you throw it away?

My thunder comes before the lightning; my lightning comes before clouds; my rain dries all the land it touches. What am I?

A man has to get a fox, a chicken, and a sack of corn across a river.

He has a rowboat, and it can only carry him and one other thing.
If the fox and the chicken are left together, the fox will eat the chicken.
If the chicken and the corn are left together, the chicken will eat the corn.

How does the man do it?

Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?

Before reading ahead, you must know the fact that only one of the people here is telling the truth.

A says that B is lying.
B says that C is lying.
C says both A and B are lying.

Can you find out who is speaking the truth?