A.inB.withC.onD.atHis performance( )the mathematics exa……

单项选择题No one saw the thief when he entered( )the buliding.

单项选择题( )child enjoys Christmas.

单项选择题If the corporation wants to increase its (),it must reduce operating expense.

单项选择题He hides behind door or creeps under a table to () from his enemies.

单项选择题Some of them did not get a chance to see the Olympic flame because of the () changes, but we, indeed, feel their passion for China and the Olympics.