The resealcohol.

It is difficult to tell exactly ____ the saying began, but it is probable that it was in the theater or movie industry.

下列各句中，有语病的一句是

Sir,can I smoke here? -At no time _____ in the meeting-room. [ ]

Mike is the __________student to come to school these days. —Yes, he is. He is the only ________American here!