用英语写出下列数字。
1. 31 _____________    2. 33 _____________
3. 37 _____________    4. 48 _____________
5. 49 _____________    6. 51 _____________
7. 52 _____________    8. 54 _____________

There are  days in January. (   )

A．thirty

B．thirty-one

C．twenty-nine

Think and choose.
1. Family: _________________
2. Number: ____________________

A．father

B．eleven

C．grandpa

D．four

E．grandma

F．brother

G．ten  H. nine

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.
________ + ________ = ________

These two ducks have _____legs. （  ）

A．two

B．four

C．three