Lesson 25 (Advanced 1 – C1) Plastics: the bane of our lives? You need to be logged in to access this lesson.
Lesson 27 (Advanced 2 – C1) Explaining, Agreeing, Refusing You need to be logged in to access this lesson.
Lesson 26 (Advanced 2 – C1) Sentence re-write: causative You need to be logged in to access this lesson.