Although this         sound like a simple task, great care is needed.

— Is John coming by train ? — He should, but he ______ not. He likes driving his car. 

He commanded the students ______ the classroom before he returned.

We _____ last night,but we went to appreciate the flowerbeds and streetlights in Tian’anmen Square instead.

（山东省淄博市2009学年度高三二摸，35）Zhang Lin was addicted to computer games during his last year in high school , otherwise he         ____________a student of Beijing University .