1) ___ I opened the window, the bird flew in. a) After b) Because c) When d) While 2) The students stopped talking ___ the principal entered. a) as b) during c) when d) while 3) I broke the glass ___ I was washing it. a) before b) because c) when d) while 4) We were watching a movie ___ the power went out. a) after b) as c) when d) while 5) ___ he was running, he twisted his ankle. a) Until b) Because c) When d) While 6) ___ I was reading the book, I didn’t hear you come in. a) As b) Since c) When d) While 7) My mom was cooking ___ I set the table. a) while b) before c) when d) during 8) He was making a call ___ the meeting started. a) as b) before c) when d) while 9) I saw him ___ I was walking to the market. a) after b) during c) when d) while 10) She was sleeping ___ we came home. a) before b) after c) when d) while 11) I was reading ___ he entered the room. a) during b) since c) when d) while 12) ___ the music was playing, everyone danced. a) Before b) After c) While d) When 13) ___ I was cleaning, I found my old diary. a) Since b) When c) While d) Before 14) ___ I turned around, he had disappeared. a) Before b) Since c) When d) While 15) The teacher was writing on the board ___ the students were copying. a) after b) since c) while d) when

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