Students ________________slippers(拖鞋) when they are at school.

We ______ to close the windows before we left the lab.

---You have found your lost umbrella, haven’t you?----Yes.I        it behind the door this afternoon.

—Where did you go last night?－I _______to go to Lily’s birthday party.

—Look at the sign on the right. —Oh, parking ______ here.