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TOEFL Listening Practice - Lecture 16

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Xuất bản 15/08/2015
ANSWERS (below) 1. d 2. b 3. a & d 4. -1) Rainwater forms... -2) Dissolving limestone... -3) An underground cavern... -4) The roof collapses... 5. The first picture from the left 6. The third picture from the left 7. c & d
TOEFL Practice learning Method