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Unit 2 There are forty students in our class Lesson 9习题2一、 选择填空1. How many books _ you have?A. are B. do 2. Lets _ the children in need.A. help B. to help3. We have forty _.A. books B. book4. How many books_ there?A. are B.do二、 找邻居1. Twenty _ 2. Forty_ 3.Sixty_