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I think ______ is necessary ______ us to do something to protect birds.

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it , protect    its, to protect    it’s , protecting    it , to protect  
will not be sent; that    should not be sent; what    not be sent; that    should not send; what  
give   to give    gave    Given  
it    that    this    one  
it, for Jim and me  it’s, to Jim and me   that , for Jim and I  that’s, to Jim andI.  
that; learning    it; to learn    that’s; to learn    it’s; learn  
persuaded   advised   required   suggested  
it, for Jim and me    it’s, to Jim and me   that , for Jim and I    that’s, to Jim and I  
that; of    it; of    that; for    it; for  
persuaded    advised    hoped    suggested  
which I think is  which I think it is   I think which is  it I think is  
necessary   boring   exciting   interesting  
I fully appreciate your invitation.  Sorry, I can' t take it.  I think it won' t be necessary.  I'd love to, but I have a prior appointment.  
it; for Jim and me    it’s; to Jim and me    that; for Jim and I    that’s; to Jima andI.  
it   that   this   one  
If so    If not    If necessary    If possible  
for; to lie    of; to lie    for; lying    of; lying