One of our rules is that every student ________ wear school uniform while at school.(2012·辽宁)

—What does the notice on the wall say?—“No person       take books out of the reading room; otherwise he would be fined.”

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

A hot balloon blew up in Egypt. There ________ something wrong with the quality of it.

 — Oliver looks a bit upset, did you tell him the bad news?— Yes, but I _____ him after his birthday party.