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Twenty-two
twenty-one twenty-two
twenty-three twenty-four
twenty-five twenty-six
twenty-seven twenty-eight
twenty-nine
How many girls are there in your class?
There are twenty.
twenty-one 21
课后练习 ：
一． Kate 正在做数学题，你能帮她填上适当的基数词吗？
five+_________=twenty
three+eighteen=_________
________+two=twenty-six
twenty-seven=__________
four+twenty-one=__________
单项选择
How many ____are there in your class?
A. book B. student C. students
2.What’s nine and thirteen?
It’s ________.
A. twenty B . twenty-one C. twenty-two
3.________play football.
A . Let B. Lets C. Let’s
4.Let’s count ____1 _____29!
A. for ;to B. from; to C. from;and