Unit 1. Questions 1-2

Question 1. Progress Check

Which elements should be changed?

Question 2. Progress Check

Which elements should be changed?

Unit 2. Questions 1-4

Question 1. Progress Check

Which elements should be changed?

Question 2. Progress Check

Which elements should be changed?

Question 3. Progress Check

Which elements should be changed?

Question 4. Progress Check

Which elements should be changed?

Unit 3. Questions 1-2

Question 1. Progress Check

Which elements should be changed?

Question 2. Progress Check

Which elements should be changed?

Unit 4. Questions 1-2

Question 1. Progress Check

Which elements should be changed?

Question 2. Progress Check

Which elements should be changed?

Unit 5. Questions 1-2

Question 1. Progress Check

Which elements should be changed?

Question 2. Progress Check

Which elements should be changed?

Unit 6. Questions 1-2

Question 1. Progress Check

Which elements should be changed?

Question 2. Progress Check

Which elements should be changed?

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