Look up the etymology of two of the following idioms

Look up the etymology of two of the following idioms - 1) explain the origins and how/why it is used, 2) describe how you can use idioms to teach figurative/literal language.

*Break the ice 
*A bird in the hand is worth two in the bush.
*Make hay while the sun shines. 
*Back seat driver.
*Throw in the towel. 
*Every cloud has a silver lining.
*It's raining cats and dogs. 
*Hit the nail on the head.

3/4 page double spaced