By____ with each other for various items, the Native Americans were introduced to different types of tools and musical instruments.
(Word Box: incensed, doctrine, embargo, barter, forebode, fortified, formidable, inventory, susceptile, dispatch, gaunt, haggard, overt, or flustered.)

Question

By____ with each other for various items, the Native Americans were introduced to different types of tools and musical instruments. 
(Word Box: incensed, doctrine, embargo, barter, forebode, fortified, formidable, inventory, susceptile, dispatch, gaunt, haggard, overt, or flustered.)

anonymous · Answer

which words do you know don't work? You're going to have to change the word by adding an "ing" for it to work.

anonymous · Answer

Hmmm... "barter" is the only word whose meaning is consistent with the subject, but as Laura* said, you have to add "ing".

anonymous · Answer

Yeah, GeorgiaGurl is right. It is, "bartering".