(2013·沈阳重点中学协作体高三预测)I just wonder ________ that makes him so excited.

The teacher is much kinder to the top students, ______ makes the others unhappy

She devoted herself________to her research and it earned her a good reputation in her field[ ]

He isn’t _____. He always _____ his school things at home.

you look puzzled, Have youunderstood it—No．I _____another problem just now．