1. what can’t be burned by fire?

 

 

ice because it melts instead of burning in a fire and it floats in water.

 

2. what has teeth but cannot bite?

 

 

comb, it has teeth but it cannot bite.

 

3.  how many letters are in the alphabet?

 

 

in the alphabet there are 11 letters.

 

4. what is used by man, tossed by trees, everywhere but unseen?

 

 

the answer is air as we use them, also it is tossed by trees but is unseen.

 

5.  i am longer than a decade and shorter than a millennium. what am i?

 

 

it is the century which is longer than a decade and shorter than a millennium.

 

6. what has four fingers and a thumb, but is not living?

 

 

 gloves has four fingers and a thumb but is non living.