-Sorry, do you mind if I smoke here? -Yes,.
you could
go ahead
I do
my pleasure
The group is made up____five students. And they are studying hard to make up____ the lost time.
The boy is waiting ____ his sister and they will go to the hospital to wait ____ their sick mother.
Fresh air is good ____ your health.
It's very kind____ you to repair the bike ____ me.
We go to school ____ a bike.