Gap Fill - Factor X - Level 1

HOW TO PLAY:

  • Choose the correct word from the drop-down menus below.
  • Click the button at the bottom to check your answers.
  • Press the "refresh" button on your browser to play again.
  • After this paragraph, go to Paragraph 2.

   bacteria      common      deadly      ground      infectious      little      professor      these      thousands      unknown   

Paragraph 1

Old under the ground could contain many diseases. The bacteria have been trapped in permafrost for of years. Permafrost is long-frozen . It is in mountains and near the North and South Poles. It is melting because of climate change. This could release , harmful viruses. Scientists are calling 'Factor X'. An diseases said we know about Factor X.

Now go to   Paragraph 2.

Back to the Factor X lesson.

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