Carols and Ming are good friends.____ of them study in Class Four， Grade One of NO. 3 Middle School. Ming is good at ____ but Carols is a little weak.

    One day they had an English test. Ming got a full mark， ____ Carols did not pass it. Ming was so happy ____ he began to play all day.

    Carols felt a little sad， but he did not want to ____ up. He made a decision to catch up with his best friend， Ming， and the ____ classmates in his class. He corrected all the mistakes in his paper ____ the help of the teacher. He also studied hard at home on weekends. In the evening， Carols was working hard at English while Ming was ____ computer games.

    A month later， they had another English exam. They were surprised that Carols got a ____ mark but Ming failed the exam.

    Do you know the ____?