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TOEFL-style
Levels: B1–C2 · 4 lessons
Section 3
C1 · Lessons 36–394
36. How glaciers carve valleys
5 sentences · Level C1 · 6 min
37. Asking a professor for an extension
5 sentences · Level C1 · 6 min
38. The puzzle of dormant seeds
5 sentences · Level C1 · 6 min
39. Why languages borrow words
5 sentences · Level C1 · 6 min