I don't know the reason ______ you were absent from the meeting, but I'm sure someone will tell me the reason ________ you haven't told me.
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.