阅读短文，用括号中所给词的适当形式填空。

    Mrs. White     1    (have) two children. Tommy is seven, and Annie is four. Tommy    2    (go) to school,

but Annie doesn't. When Tommy    3    (be) at home, he often plays with Annie. Usually he's very nice to

his little sister. One day the two children   4     (play)at home. Suddenly Annie begins    5    (cry).Their

mother runs over and asks, "Why are you crying?" "Tommy breaks (打破) my doll," says Annie. "How

does he break it?" "I hit (打) him on the head with it."    6    (say) Annie.

1.________ 2._______ 3.________ 4.________ 5.________ 6.________

进口环节的增值税由海关征收，其他环节的增值税由税务机关征收。