1) We heard a crash ________ we were having a music lesson. a) while b) when 2) We were studying in the library ________ we heard the fire alarm. a) while b) when 3) I walked into the bank ________ the men were robbing it. a) while b) when 4) My mother helped the driver ________ we were waiting for the ambulance. a) while b) when 5) I was taking the lift ________ all the lights went out.  a) while b) when 6) Your grandma arrived ________ you were watching TV. a) while b) when

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