Sure! Here is the completed puzzle with the secret word:

1   My favourite character in the play was the king.

2   He wore a green and gold crown.

3   All the actors had learnt their lines.

4   The red curtain opened.

5   The stage was made of beautiful wood.

6   At the end of the play, the audience clapped loudly.

7   The spotlight shone brightly on the actors.

Secret word: THEATER

I hope this helps! Let me know if you need any further assistance.