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I think     necessary     us to do something useful to protect the birds.(  )A.that; for B.it; of C...

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I think it is    I think which is    which I think it is    which I think is   
it , protect    its, to protect    it’s , protecting    it , to protect  
this, for    it, of    this, of    it, for  
develop; stay out    have; go out    get; go home    develop; stay awake  
vital, happy    important, healthy    necessary, health    vital, healthy  
it    that    this    one  
that; learning    it; to learn    that’s; to learn    it’s; learn  
develop; stay out    have; go out    get; go home    develop; stay awake  
what; on    this; for    that; with    it; to  
it, for Jim and me    it’s, to Jim and me   that , for Jim and I    that’s, to Jim and I  
possible    necessary    useful    important  
persuaded    advised    hoped    suggested  
which I think is  which I think it is   I think which is  it I think is  
which I think is   which I think it is   I think which is   I think it is  
it; for Jim and me    it’s; to Jim and me    that; for Jim and I    that’s; to Jima andI.  
I think it is    I think which is    which I think is    which I think it is  
it   that   this   one  
If so    If not    If necessary    If possible  

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