... ,32, 41, 6, 8, 12, 20, 21, 52 , 100, 200 ,32, 41, 400, 900, 17, 25, 10 . 400, 900, 17, 25, 10 . 400 900 8 20 Friday, October 26 th , 20 07 Unit4: BIG OR SMALL ? Lesson 2 : (A3,4) Unit4: BIG OR SMALL ... 4.In the city . 5. No, it isn’t . It’s big . 5. No, it isn’t . It’s big . 6. 20. 6. 20. 7. 900. 7. 900. Unit4: BIG OR SMALL ? Lesson 2 : (A3,4) Answer key : Answer key : 1. In the country. ... in Thu’s 6. 20. How many classrooms are there in Thu’s school ? school ? 7. 900. How many students are there in Thu’s 7. 900. How many students are there in Thu’s school ? school ? Unit4: Lesson...