1) I was studying for my exam ______ my friend called me. a) When b) While 2) ______ they were having dinner, the lights went out. a) When b) While 3) She was cycling to work ______ she saw a famous actor. a) When b) While 4) I met Sarah ______ we were waiting for the bus. a) When b) While 5) ______ I was listening to music, my brother entered my room. a) When b) While 6) We were walking in the park ______ it suddenly started to snow. a) When b) While 7) The teacher was explaining the task ______ the fire alarm rang. a) When b) While 8) ______ I was talking on the phone, my dog started barking loudly. a) When b) While 9) He fell asleep ______ he was watching a boring film. a) When b) While 10) ______ they were repairing the roof, it began to rain heavily. a) When b) While 11) I broke my glasses ______ I was cleaning them. a) When b) While 12) ______ I was crossing the street, I saw my old neighbour. a) When b) While 13) We were hiking in the mountains ______ we found a small waterfall. a) When b) While 14) ______ she was watering the plants, she noticed a bird’s nest. a) When b) While 15) The children were playing football ______ their parents were preparing lunch. a) When b) While 16) ______ we were discussing the project, the manager entered the office. a) When b) While 17) I saw a fox ______ I was driving home late at night. a) When b) While 18) ______ they were swimming in the sea, they saw a dolphin. a) When b) While 19) She was trying to fix her bike ______ she cut her finger. a) When b) While 20) ______ I was waiting in the queue, I heard two people arguing. a) When b) While

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