1) Natalia and Celina were surprised _____ they heard the news. a) WHILE b) WHEN 2) The movie started ________Irene was getting some popcorn. a) WHILE b) WHEN 3) Masayo clapped for the singers____________ they finished. a) WHILE b) WHEN 4) Mindy was sleeping _____ Sarang called her from the United States. a) WHILE b) WHEN 5) Kinu was eating at a restaurant _________ Hitomi called her. a) WHILE b) WHEN 6) Karen and Mia were walking home ______ they saw an accident. a) WHILE b) WHEN 7) Youngjoo saw a beautiful lake ____ she was hiking with Hitomi in the forest. a) WHILE b) WHEN 8) Moon and Emily stayed inside ______ it was raining. a) WHILE b) WHEN 9) Masayo and Olena saw dolphins ______ they were sailing on the ocean. a) WHILE b) WHEN 10) Youngjoo was making the cake ______ Mikako arrived. a) WHILE b) WHEN

Use "when" before a simple past. Use "while" before a past continuous.

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