click on this link exercise 9 A class 8
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click on this link exercise 6G
click on this link class 8 ex 6F
click on this link exercise 6c to 6E class 8
click on this link class 8 ch 6 ex 6b
click on this link exercise 4b
click on this link chapter 3 last exercise
click on this link exercise 3b class 8
click on this link ex 3a
click on this link EXERCISE 2C