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They don't know whether the teacher or the students     going to join them. A. is B. are C was D. ...

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whether; whether    how; whether    if; whether    whether; if  
whether he is at home  if he is at home   that he is at home  whether is he at home  
whether, whether    whether, if    if, whether    that, if  
if; take    if; follow    whether; give    whether; seek  
whether, on    if, in    whether, in    that, at  
ends    results    effects    causes  
that; if    that; whether    whether; if    whether; whether  
if; Whether  whether; Whether   if; That  if; If  
if; If    whether; Whether    whether; If    if; Whether  
if or not  whether or not  if not  whether not  
if, Whether    whether, Whether    if, That    if, If  
whether can he finish    whether he could finish    whether can how finish    whether he can finish  
pause  refuse  reject  wait  
when;whether  if;whether  that;if  whether;if  
ends    results    effects    causes  
whether we will have    whether we have   whether will we have    whether do we have  
whether we will have    whether we had    whether will we have    whether did we have  
if; Whether    whether; Whether    /; If    whether; If  
if; whether    whether; whether    whether; if    if ; /