Caching static content- getting a "F" since Sweet Captcha…

My site getting an “F” at WebPagetest for caching static content, since installing Sweet Captcha… Below is just a portion of the readout from the test, it goes on considerably further, pretty much all of it in regards to Sweet Captcha… I’d loves to get some comment on this…??

Leverage browser caching of static assets: 53/100
FAILED – (No max-age or expires) – http://sweetcaptcha.s3.amazonaws.com/widget/v2/upload/answer_137.png
FAILED – (No max-age or expires) – http://sweetcaptcha.s3.amazonaws.com/widget/v2/upload/answer_124.png
FAILED – (No max-age or expires) – http://sweetcaptcha.s3.amazonaws.com/widget/v2/upload/answer_133.png
FAILED – (No max-age or expires) – http://sweetcaptcha.s3.amazonaws.com/widget/v2/upload/answer_138.png
FAILED – (No max-age or expires) – http://sweetcaptcha.s3.amazonaws.com/widget/v2/upload/answer_123.png
FAILED – (No max-age or expires) – http://sweetcaptcha.s3.amazonaws.com/widget/v2/upload/answer_149.png
FAILED – (No max-age or expires) – http://sweetcaptcha.s3.amazonaws.com/widget/v2/upload/answer_141.png
FAILED – (No max-age or expires) – http://stats.wordpress.com/g.gif?host=www.spiritawake.net&rand=0.1793956297915429&v=ext&j=1%3A2.9&blog=61174886&post=16&tz=-7&ref=
FAILED – (No max-age or expires) – http://sweetcaptcha.s3.amazonaws.com/widget/v2/upload/answer_145.png
FAILED – (No max-age or expires) – http://sweetcaptcha.s3.amazonaws.com/widget/v2/upload/answer_126.png

(it goes on…)

https://wordpress.org/plugins/sweetcaptcha-revolutionary-free-captcha-service/