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I’m not sure whether he has the key that ______ the door of the classroom.

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when, if    whether, whether    if, whether    whether, if  
if    whether    that    who  
interested  interesting  interestingly  interestedly  
as well    as well as    as usual    as soon as  
interested    interesting    interestedly    interestingly  
that; that    that; whether    if; that    if; whether  
interested    interesting    interestingly    interestedly  
how he will be back    that he has come back    why he has come back    if he has been back  
when  what  whether  how  
that, When    that, If    if, Whether    whether, When  
worked at   was working on   worked on   was working at  
that ; that    that ; whether    if ; whether    whether ; whether  
that ; that   that ; whether   if ; that   if ; whether  
try    organize    negotiate    manage  
adjust    fit in with    keep it up    get along  
The world is his oyster.    Don’t trouble trouble until trouble troubles you.    He has butterflies in his stomach.    It costs you an arm and a leg.  
that ; that    that ; whether    if ; whether    whether ; whether  
that; Until    whether; If    that; Unless    whether; Unless  
at end    at length    in turn    in general  
cares for   depends on    lives on    agrees with  

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