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When a student asks__________it is worth staying up doing their lessons, a teacher may find it diffi...

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in, to    to, by    to, in    in, in  
to do    to have done    to be doing    to be done  
to be praised  praising   praised  to praise  
in; to    to; by    to; in    in; in  
was used    use    uses    used  
that  when  which  where  
means  process   level  criteria  
has not studied psychology  had studied psychology  did study psychology  studied psychology  
has not studied biology    did study biology    had studied biology    studied biology  
to be praised    praising    praised    to praise  
has not studied psychology  had studied psychology  did study psychology  studied psychology  
wondering    wandering    wondered    wandered  
an; a    a; an    an; an    the; an  

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