1) The children were doing their homework ______ the door knocked. a) when b) while 2) ____ my dad came home, I was learning. a) when b) while 3) _____ John was driving home, he saw a wonderful building. a) when b) while 4) I had a bad dream _____ I was sleeping in the night. a) when b) while 5) They were laughing ____ I entered the room. a) when b) while 6) The girl took a photograph _____ her mother was cooking. a) when b) while 7) He started to sing _____ he was watching a movie. a) when b) while 8) ______ my brother came into my room, I was sleeping. a) when b) while 9) ______ the boys were walking on the river, it began to rain. a) when b) while 10) Mike spoke two languages _____ he started the primary school. a) when b) while 11) _____ I was reading a book, my sister listened to music. a) when b) while 12) _____ I saw birds, they were flying in the air. a) when b) while

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