I'm wondering about how to, in one phrase, say, 'Waiting for the classroom to be full'. I was talking with someone who was an international student just like me. So the full conversation was:
Me: Hey! How are you doing?
Him: I'm in my classroom. But we are waiting for the classroom 'to be full'.
I can tell right away it's not natural to say that. However, I've come up with alternatives that can be used in that situation: '
We will start as soon as the remaining students come'
'We are waiting for the remaining students to come'
'We are just waiting for 'everyone' to come' (everyone in this case includes
'the people who are already present in the classroom' + 'people who will later come to the classroom'
I feel that my expressions are still long. Are there any brief English expressions/ phrases that I can use in this case?