Here is a context clues worksheet on the verb assimilate that you might find handy in teaching social studies. It’s used both transitively and intransitively. Beware, however (and you may want to consult Merriam-Webster’s Collegiate Dictionary on this), when you use it transitively, with the prepositions to, into, and with, you will need to use caution as meaning can shift in those constructions.
If you find typos in this document, I would appreciate a notification. And, as always, if you find this material useful in your practice, I would be grateful to hear what you think of it. I seek your peer review.