Where can we now find answer keys/teacher version for article responses?

Hi Mariam and apologies for the delay in response. You can find teacher lesson guides by clicking on the hammer "Teacher Tools" in each lesson of the course. There you can download the teacher lesson guide for each unit, which has the sample answers for all articles, videos, graphic bios, and activities. Just note that we are still adding these for the later units of each course, but we're working hard to get them up on the site as fast as we can. Thanks!