What is Tom up to? He’s seldom turned in his assignments these days, ________?[ ]

His lack of professional knowledge ______for the failure of the experiment. [ ]

Two hours away from the tall buildings of New York．

Mr. Smith, _______ is the new bridge— Oh, let me see! It’s about 800 metres.

One more question, Sir? —-Wait a minuteI ____ your questions for more than 30 minutes without a breakWhere is my cup?