1) ________ I woke up this morning it was snowing. a) when b) while 2) I broke my leg ________ I was skiing. a) when b) while 3) _________ the quests arrived, __________ Jane was cooking dinner.   a) While, when  b) When, ------ c) While, ------ d) ------, when 4) __________ they came ________________ I was wearing a face mask.  a) ---------, while  b) While, --------- c) When, while d) -------, when. 5) While people _______________ (sunbathe) on the beach tsunami waves ______________ (appear). a) sunbathed, appeared b) sunbathed, were appearing c) was sunbathing, appeared d) were sunbathing, appeared 6) The volcano _______________(erupt) for the first time while we ____________(evacuate). a) was erupting, evacuated  b) erupted, were evacuating 7) They ______________ (ski) when the avalanche ______________ (come) down. a) skied, was coming b) were skiing, came c) skied, came d) were skiing, was coming 8) The fire ____________ (start) while they _______________ (search) for the clue how to escape from the room.  a) was starting, were searching b) started, searched c) was starting, searched d) started, were searching 9) Two farmers ____________ (work) in the forest when they ___________ (see) the fire. a) worked, were seeing b) were working, saw c) worked, saw d) were working, were seeing 10) The chair ___________ (collapse) when she ___________ (sit) down on it. a) collapsed, sat b) collapsed, was sitting c) were collapsing, was sitting 11) While we ______________ (drive) home, we _____________ (hear) the first thunders. a) drove, heard b) were driving, were hearing c) were driving, heard d) drove, were hearing 12) The little boy ______________ (start) the fire while he ________________ (play) with fireworks. a) was starting, was playing b) was starting, played c) started, was playing d) started, played 13) While they ____________ (wait) for the rescue workers, the roof _____________ (collapse). a) were waiting, collapsed b) waited, was collapsing c) waited, collapsed 14) The police believe that the cigarette ___________ (cause) the fire. a) was causing b) were causing c) caused 15) When the river _________ its banks, people _______________ (work) as usual.  a) was breaking, were working b) broke, were working c) broke, worked d) was breaking, worked

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