There is gas _______ somewhere; can you smell it?

The editor could have ____ the error before it was published; it was so obvious. 

No one is allowed, no matter who he is, _____ the room unless he has a permit.

——Do you know who left the computer on all night long? ——It seems that Tom is_______. He played computer games yesterday afternoon

We were supposed to move into our new classroom building at the beginning of this month，but things didn’t ________ as planned.