She finds _____ interesting to play with this dog.
[     ]
A. that
B. it
C. one
D. this
I think the snow will make _____ difficult for us _____ the way back home.  
[     ]
A. that; to find
B. it; to find
C. that; find
D. it; find
_____ that they enjoyed the game very much.   
[     ]
 A. I seemed
B. It seemed for me
C. I seemed to know
D. It seemed to me
_____ hard to say whether it's good or bad to clone human beings,I think.
[     ]
A. It    
B. This is    
C. That's    
D. It's
_______ will take John one year to finish the plan.
[     ]
A. Tom    
B. she    
C. It    
D. who
The man found ________ very difficult to get to sleep.

[     ]

A. it
B. that
C. what
D. them
 _____ is a good chance _____ them to go abroad(国外).
[     ]
A. This; for
B.  It; of
C.  It; for
D. That; of
_____ is wrong to copy other students' homework.
[     ]
A. This
B. That
C. It
D. There
_______ is dangerous for us to swim in the river alone.
[     ]
A. It
B. That
C. This
It's an opportunity ____a child          the fire drill.
[     ]

A. for; do
B. for; to  do
C. as; do
D. as; to  do

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