Listen and complete the conversation with the expressions in the box. Then practise it in pairs.

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!
   can I      Certainly      I’m afraid not      Is it OK   
Lan: Mum (1) go to my friend's birthday party this Saturday evening?
Lan's mother: (2) . Whose birthday is it?
Lan: It's Mai's birthday, Mum. (3) if I stay the night at her house after the party?
Lan's mother: Oh, (4) . You must come back home before 10 p.m. We're going to visit your grandparents early on Sunday morning.
Lan: OK, Mum. I'll be home before 10 p.m. then.