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Unit 2 There are forty students in our class Lesson 11习题1一、 写单词1. pen_ 6. ninety_2. pencil_ 7. One hundred_3. bag_ 8.student_4. book_ 9.need_5. fifty_ 10.school_二、 算一算1. Fifty +Fifty= _2. Fifty + forty=_3. Thirty + sixty=_