Zhanglin was lost in computer games during his last year in high school, otherwise he_______ a student at Beijing University. 

A hard-working man        become a great scientist, but a great scientist        be a hard-working man.

If you _______ carry with you the belief that all you do is right, it’s none of my business.   

 — Is Jim coming by train?  — I’m not sure. He_____ drive his car.

—Lily,______ do you study for a math best? —By asking my teacher for help.