Julia is very clever．In fact，I doubt whether anyone in the class has_______ IQ．

He sat there for a long time _____ doing anything. [ ]

There will be a _______bridge over the river.

Is this _______ pencil case? –No, it’s ______ eraser．

Excuse me, Sir .But smoking is not allowed here.—–Sorry,I didn’t see the sign.I’ll __________ my cigarette at once.