Gap-fill exercise

1. Fill in all the gaps, then press "Check" to check your answers.
2. Use the "Hint" button to get a free letter if an answer is giving you trouble.
3. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!

bacteria.jpgMicroorganism is a thing.
There are four types of microorganism: , , and .
Microorganism can , and .
The useful of microorganism: , and .