1) ______ I was walking in the park, I saw a beautiful rainbow in the sky. a) When b) While 2) Her phone suddenly rang ______ she was reading a book. a) When b) While 3) ______ we arrived at the party, the guests were dancing. a) When b) While 4) ______ they were hiking in the mountains, it started to rain heavily. a) When b) While 5) The lights went out ______ I was cooking dinner, so we had to order pizza. a) When b) While 6) The people were singing and clapping ______ the concert started. a) When b) While 7) He was working on his project ______ his computer crashed and he lost all his work. a) When b) While 8) They were driving to the beach ______ they saw some dolphins swimming in the ocean. a) When b) While 9) They heard some wolves ______ they were camping in the forest. a) When b) While 10) The cat knocked over a vase ______ they girl was sleeping. a) When b) While

WHEN or WHILE?

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