根据短文内容，联系上下文，选出一个最佳答案，并将序号涂在答题卡相对应的位置。(共10小题；每小题1分，满分10分)
I’m ___ middle school student. My name is Liu Ming. I’m ___ Class 1, Grade 2. There ___ fifty students in our class. There are two American girls. We go to school  ___weekdays. We stay 40 ___home on Sundays and Saturdays. We like our class. We like ___ teachers. We have six classes a day. But we  ____four classes on Thursday. On Thursday afternoon, we don’t have ___classes. We all _____ games. Look! The boys are playing football  ____the girls are singing happily.
（1）A. a          B. an          C. the           D. /
（2）A. at         B. in         C. of            D. on
（3）A. has       B. have       C. is            D. are
（4）A. at        B. in         C. on             D. of
（5）A. at        B. in         C. on            D. of
（6）A. we        B. our         C. us             D. ours
（7）A. have       B. has        C. there is      D. there are
（8）A. a         B. an         C. some           D. any
（9）A. play      B. playing     C. to play       D. playing
（10）A. but      B. and         C. or            D. So