______ is difficult to work out the math problem.
[     ]
A. That
B. This
C. It
D. One
— A latest magazine, please.
— Only one left. Would you like to have ____, sir?
[     ]

A. this
B. that
C. it
D. one

I find ______ difficult to remember everything.

[     ]

A. it
B. one
C. that
D. this
Being a parent is not always easy, and being the parent of a child with special needs often carries
with ______ extra stress.
[     ]
A. it
B. that
C. him
D. one
______ is our duty to try our best to deal with each challenge in our education.
[     ]
A. It
B. This
C. That
D. Its
根据上句完成下句，且使上下两句意思一致，每空一词。
1. To eat a balanced diet is very important. 
    ________ very important ________ eat a balanced diet.  
2. They are watching TV at home now. 
    They are watching TV at home ________ ________ ________.
3. What's wrong with your sister? 
    What's ________ ________ with your sister?
4. She has a sore throat.
   There is something ________ ________her throat.
5. There is a lot of milk in the bottle.
    There is ________ ________ milk in the bottle.
______ is difficult to learn English.
[     ]
A. This
B. That
C. It
D. Which
          is believed that Bell invented the first telephone in 1876.
[     ]
A. This
B. That
C. It
D. One
Ann finds ______ very difficult for her to play the piano well.
[     ]
A．this
B．that
C．what
D．it
I think ______ necessary for us to learn English well.
[     ]
A. it
B. its
C. that
D. that's
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