Here is a great thing to do with your online students: Donate Free Rice to help end world hunger... (and improve their vocabulary while you are at it!)
Here is a news article about it, in case you would like to use it for current events.
Advertising at the bottom of the screen changes with every question to promote the companies that donate the rice.
Level 50 is all but impossible to get to without a dictionary, which I encourage... After all, what is the harm in having students looking up words in the dictionary? This is also a good time to introduce using Google as a dictionary.
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On a similar (Social Responsibility) topic, check this out:
"Make Your Difference is a contest to empower youth to impact the world through creating a new possibility in their school, community, city and beyond into positively impacting the world."
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We really can make a difference, especially if we help our students recognize that they can make a difference!