1) _________ he was reading a book, his friend phoned him. a) when b) while 2) They were playing tennis __________ they heard a strange noise. a) when b) while 3) __________ we were watching TV, the lights went out. a) when b) while 4) __________ my mum came home, my sister was sleeping. a) when b) while 5) _________ John was driving home, he saw an accident. a) when b) while 6) Mike and Sarah were cooking _________ the telephone rang. a) when b) while 7) _________ Mike was climbing the tree, he saw Linda. a) when b) while 8) 2. I was walking down the street _________ I met an old friend from school. a) when b) while

When or While

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