Not sure what your question is because the text you provided has grammar mistakes, not only missing blanks. Due to the grammar mistakes in the text, I can't figure out the context and therefore there are multiple ways this text could be meant.
One way to fill in the blanks and correct the mistakes in the text would be:
Frau Stein, kochen Sie gern mit Ihren Kollegen im Kochkurs?
- Ja. Aber noch lieber gehe ich zu meinem Freund und koche mit ihm in der Küche.