• the advanced-level cloze and modified word form tasks given in the opening reading section of each unit
• the synonym / phrase recognition tasks in Part A of each chapter
• all 16 lexis-in-context sentences in Part B (for the learner's benefit, full sentences have been reproduced with the correct responses appropriately highlighted)
• all grammar-related Language Focus questions in Part C
The Answer Key also includes the original form of all deconstructed sentences in Part D (the "Ultimate Challenge").
Where appropriate, alternative responses that might be acceptable have also been provided for the open cloze tasks in all odd-numbered units. Students are encouraged to compare their original responses with the suggested answers to better identify learning goals.