1) I smiled ___ I saw my friend. a) when b) while 2) She waved ___ the bus stopped. a) when b) while 3) We laughed ___ the teacher told a joke. a) when b) while 4) He stood up ___ the bell rang. a) when b) while 5) They clapped ___ the show ended. a) when b) while 6) I opened the door ___ the phone rang. a) when b) while 7) I was eating dinner ___ the phone rang. a) when b) while 8) She was sleeping ___ the baby cried. a) when b) while 9) We were watching TV ___ the lights went out. a) when b) while 10) He was walking home ___ it started to rain. a) when b) while 11) They were playing football ___ it began to snow. a) when b) while 12) I was reading ___ my mother called me. a) when b) while 13) She was cooking ___ the fire alarm rang. a) when b) while 14) I was reading ___ my sister was listening to music. a) when b) while 15) She was cooking ___ he was setting the table. a) when b) while 16) We were studying ___ our parents were working. a) when b) while 17) He was drawing ___ she was painting. a) when b) while 18) They were talking ___ the children were playing. a) while b) when 19) I was cleaning my room ___ my brother was watching TV. a) while b) when 20) She was singing ___ he was playing the guitar. a) while b) when

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