There are ______ days in September. (    )

A．twenty-nine

B．thirty

C．thirty-one

根据图片判断句子正误：I’ll pick eighteen pears. （_____）

写出下列单词的正确形式。
1.green(对应词)---__________
2.first(基数词)----____________
3.sing (现在分词)--___________
4.new(反义词)---___________
5.friend(复数形式)---________
6.name(过去式)---__________

There are 　　　　months in a year. (   )

A．twenty

B．four

C．twelve

读一读写出数学算式。
1. How much is thirteen and ten? 
________ + ________ = ________
2. How much is twenty and eleven?
________ + ________ = ________
3. Twelve and three is fifteen.
________ + ________ = ________
4. Nine and fifteen is twenty-four.
________ + ________ = ________