An economic bubble (IR level 4 unit 6 text 1)

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    www.youtube.com , level=13, 8:08 , on 2019/07/29

The benefits of immunization

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    www.youtube.com , level=13, 7:44 , on 2019/07/29

Pieces of a Puzzle: The Evidence for Pangaea.

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    www.youtube.com , level=13, 6:50 , on 2019/07/28

ostrich farming

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    www.youtube.com , level=14, 4:49 , on 2019/07/26

the environment

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    www.youtube.com , level=12, 2:03 , on 2019/07/26

north american women's attitudes toward money and saving

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    www.youtube.com , level=15, 4:39 , on 2019/07/26

Japan to Use Robot Assistants in 2020 Olympics

Posted by sjhong***, views: 10886,
    www.listen-and-write.com , level=9, 1:08 , on 2019/07/25

the fast food revolution

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    www.youtube.com , level=13, 6:05 , on 2019/07/25

what is success?

Posted by 212158***, views: 12887,
    www.youtube.com , level=11, 5:58 , on 2019/07/25

the falkirk wheel how it works

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    www.youtube.com , level=10, 5:18 , on 2019/07/25