—Where did you find our chemistry teacher? —It was in the lab ______ he was doing his experiment.
The airport _______ next year will help promote tourism in this area.
Nowadays people are more concerned about the environment _______ they live.
which university to attend, the girl asked her teacher for advice.
He is so busy. He cannot afford enough time with his son _______ he wants to.
you said at the meeting describes a bright future for the company.