As we all know,parents are concerned ________their children’s study,because it is concerned ________their future.
What’s the _____ of having a public open space where you can’t eat, drink or even simply hang out for a while?
The hall __ we saw the film was very clean.
It had no other effect except ___ him all the anxious.
It might __ reasonable to start the meeting at 4:30.
It's clear that the thief was seen __ into the room that night.