Activity 3. Complete the sentences with "must", "don't" or "can't". Use the words in the box. protect throw keep sleep 1. We must protect_ the earth. 2. You must throw_ garbage in the bin. 3. The soup is yummy. You 4. school. it! at fight try wash take 5. You the class. 6. here. 7. You quiet in the library. in photos 8. You your hand before you eat.
