—John, look at the time. _____ you play the piano at such a late hour?—Oh, sorry.
Would you like towith us to the film tonight?
--I'm sorry I made a mistake! --Nobody is perfect.
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.