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.

   ancient      before      danger      deadly      harmful      million      problem      scientists      virologist      worldwide   

Paragraph 2

There are viruses in the permafrost that are up to a years old. A said these unknown, " viruses" could be terrifying because we have never seen them . He also said diseases like smallpox could be released . Factor X could be an even bigger . However, say the release of methane is a bigger from melting permafrost. Methane is 80 times more than CO2.

Try the Factor X - Level 2 gap fill.

Back to the Factor X lesson.

Share this lesson

More Free Sites by Sean Banville

Online Activities