• In the white boxes below, type the words you hear. You will hear each word twice.
       (Remember to use the correct spelling and capital letters, etc.).
  • Click the button at the bottom to check your answers.
  • Press the "refresh" button on your browser to play again.

1. something under ground
2. trapped for in the permafrost
3. It is high in mountains
4. the of unknown, harmful viruses
5. diseases
6. dangers
7. these could be harmful to
8. viruses
9. the most
10. we have never them before
11. released on a large
12. a bigger danger from permafrost

Back to the Factor X lesson.

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