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 Before taking off, the pilot c    both engines carefully.

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why; for fear that  for which; in case of   how; for fear of  that; in case  
inquired  demanded  requested  required  
am leaving for; takes off    leaves for; takes off    am leaving for; is taking off    leave for; is taking off  
is about to take off    is taking off    takes off    was taking off  
leaves; takes off    is leaving; takes off    is leaving; is taking off    leaves; is taking off  
leaves, takes off    will leave, takes off    is leaving, is taking off    will leave, will take off  
would take off    had taken off    was taking off    is taking off  
takes off, takes off    is taking off, takes off    takes off, is taking off    is taking off, is taking off  
taking off    to take off    take off    to taking off  
1eaves;takes off   is leaving;takes off   is leaving;is taking off   1eaves;is taking off  
is, taking off    are, taking off    is , taken off    are, taken off  
am leaving; takes off    leave; takes off    leave; is taking off    am leaving; is taking off  
takes off, takes off    is taking off, takes off    takes off, is taking off    is taking off, is taking off  
determine the cause before taking countermeasures  assume the shift is due to off-center loading  counterflood on the side opposite the list or trim  assume the cause is environmental forces"  
determine the cause before taking countermeasures  assume the shift is due to off-center loading  counterflood  assume the cause is environmental forces  
was taking off    is taking off    has taken off    took off  
why; for fear that    for which; in case of    how; for fear of    that; in case  

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