已知圆O：x²+y²=8，点A（2，0），动点M在圆上，则∠OMA的最大值为____ 

完形填空

      Li Lei has a good friend.    1    name is Jim. He is   2     the USA. He likes   3    food very much. He can    4    English and   5    Chinese. Li Lei and Jim are in the same(相同的)   6   . They are classmates(同学). They go to school five    7    a week. They stay    8   home on Saturdays and Sundays. At school they play    9    after class. They like swimming,    10   .