Fill in the blanks with the appropriate form of the verbs given in the bracket

Gap-fill exercise

  
Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
The children (stop) (chatter) as their teacher (enter) the classroom. Then they (stand up) as one body and (say) in a loud chorus; "Good morning, teacher."