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I often doubt __________ it is worth working so harD.

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that, whether    when, if    whether, that    why, what  
I doubted  do I doubt  I have doubted  did I doubt  
that; to survive  whether; surviving  that; surviving  what; survived  
that; whether    whether; that    that; that    whether; if  
I doubted    do I doubt    I have doubted    did I doubt  
I doubted    do I doubt    I have doubted    did I doubt  
that; whether    whether; that    that; that    whether; if  
that; that    if; if    that; if    if; that  
never doubt     always doubt     seldom ask     often wonder  
that this song is worth listening to    if this song is worth listening    that this song is worth listening    if this song is worth listening to  
about; it     of; that   about; there    to; he  
if; if    if; that    whether; whether    that; if  
I doubt    I don’t doubt    I wonder    I’m not sure  
No wonder    No doubt    No way    No problem  
that; whether    whether; that    that; which    why; how  
that    whether    weather    if  
that; that    if; if    that; if    if; that  
if, if  if, that  whether, whether  that, if  
I doubted   do I doubt   I have doubted   did I doubt  

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