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While working in the countryside , the students ________ a great deal of knowledge on plant lifE.

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talk;is working  to talk;is working   to talk;works  talk;working  
when    that    which    while  
as    for    over    with  
working    worked    he works    he is working  
working; stopping   to work; stopping   working; to stop   to work; to stop  
as    for    over    with  
as    for    over    with  
worked, got through    working, went through    was working, experienced    has worked, experienced  
working; stopping    to work; stopping    working; to stop    to work; to stop  
working; stopping    to work; stopping    working; to stop    to work; to stop  
take shallow breaths of air  ventilate the area  wear a breathing apparatus while working  keep a charged fire hose handy  
No, to stop talking   Yes ,to stop talking   No, stopping to talk   Yes, stopping talking  
pretend to be  served as   played the part in  turned to  
working; stopping    to work; stopping    working; to stop    to work; to stop  
as    for    over    with  
working; stopping    to work; stopping    working; to stop    to work; to stop  
working    to work    works    worked  
working; stopping    to work; stopping    working; to stop    to work; to stop  
working; stopping    to work; stopping    working; to stop    to work; to stop  
working;stopping   to work;stopping   working;to stop   to work;to stop  

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