or 或者或者tree 树树eleven 十一十一twelve 十二十二 thirteen 十三十三fifteen 十五十五eighteen 十八十八twenty 二十二十thirty 三十三十forty 四十四十fifty 五十五十eighty 八十八十Five and ten is fifteen .What is five and ten ?Three and eighteen is twenty-one .What is three and eighteen ?Six and thirty-nine is forty-five .What is six and thirty-nine ?Thirteen and sixteen is twenty-nine .What is thirteen and sixteen ?This is our school. Our school is very beautiful. There are twelve classrooms in our school. There is a big playground in our school. There are many trees in our school . I like our school.