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Sometimes assignments can be a bit tricky. First, try refreshing the page or clearing your browser cache. If that doesn't work, make sure your internet connection is stable. If all else fails, reach out to your instructor or tech support for help. You'll get that checkmark soon!
Thanks for your reply.
I tried restarting my PC, but it didn't work. Maybe it's bad that I'm learning in two places, at home and at work.
I will report this to technical support.