It's a good idea to check for recurring to understand how they affect the overall of the text.

what goes in those blanks?

The two words are

Explanation:

A Motif is an element which reoccurs frequently througout a text or art work that is central it.

A theme in literature is simply the big idea, central message or underlying message of a lieteray work.

Thus, fixing the words into the sentence we have:

It's a good idea to check for recurring motifs to understand how they affect the overall theme of the text.

Cheers!

recent news about two years ago indicates that a polish forestry student by chance unearthed at a depth of about 40cm (16 inches), during digging in a damp polish forest he found a 13-page manuscript into a thermos flask.

greek jew marcel nadjari was a aischwitz slave who witnessed how the nazi's built big death chambers and crematoriums and told how he was forced to escort fellow jews to the gas chambers. he accounts on this manuscript how the nazi's disguised this chambers to look like showers. also, he describes this place as a process of extermination from the chambers to the trains arriving to take the bodies.