Unit One Scientific Research (Ⅰ)
Part A
Part B
Part C
Unit Two Scientific Research (Ⅱ)
Part A
Part B
Part C
Unit Three Safety (Ⅰ)
Part A
Part B
Part C
Unit Four Safety (Ⅱ)
Part A
Part B
Part C
Unit Five Gap (Ⅰ)
Part A
Part B
Part C
Unit Six Gap (Ⅱ)
Part A
Part B
Part C
Unit Seven Gender (Ⅰ)
Part A
Part B
Part C
Unit Eight Gender (Ⅱ)
Part A
Part B
Part C
Unit Nine Entertainment (Ⅰ)
Part A
Part B
Part C
Unit Ten Entertainment (Ⅱ)
Part A
Part B
Part C
Unit Eleven Education (Ⅰ)
Part A
Part B
Part C
Unit Twelve Education (Ⅱ)
Part A
Part B
Part C
Key to Exercises