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

Find out the number of circles in the given picture having Illusion

What is the last thing you take off before bed?

Can you figure out the logic I used to decide the order of the following words:
gun, shoe, spree, door, hive, kicks, heaven, gate, line, den

Different lights make me strange by changing me into different sizes. What am I?

O_er_t_o_

Complete the missing letters of the given word.

There were three women in all the swimming costumes!
One was happy and the other two were sad!
The happy one was crying and the sad ones were smiling.
Why was this?

I am eight letters long - "12345678"
My 1234 is an atmospheric condition.
My 34567 supports a plant.
My 4567 is too appropriate.
My 45 is a friendly thank-you.
My 678 is a man's name.

What word am I?

The doctor prescribed you to take one pill from the bottle every half an hour. The bottle is now left with only three pills.

How long do you think you have before you run out of pills?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?