Gap Fill - Factor X - Level 0

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.

   ancient      before      bigger      deadly      million      more      never      smallpox      terrifying      viruses   

Paragraph 2

There are in permafrost that are a years old. A scientist said these " viruses" could be . We have seen them . The scientist said diseases like could be released. Factor X could be an even problem. We need to learn about Factor X.

Try the Factor X - Level 1 gap fill.

Back to the Factor X lesson.

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