你把朋友汤姆介绍给别人时应该说：                
[     ]
A. It is Tom.
B. This is Tom.
C. I am Tom.
D. You are Tom.
This is my mother, Mr Green. Mum,              Jim.
[     ]
A. this is
B. that is
C. he is
D. it is
The medicines made in China are cheaper than ______ made in Japan.

[     ]

A.ones
B.that
C.those
D.it
In winter, the weather in Harbin is colder than ______ in Beijing.
[     ]
A. it
B. one
C. the one
D. that
Mr Lee, ______ is my mother.
[     ]
A. it
B. this
C. she
D. Hers
The bottles of wine in my basket are more than             in Sally's.
[     ]
A. it
B. that
C. ones
D. those
The weather in Guangzhou is warmer than ______ in Chongqing.
[     ]
A. it
B. that
C. the one
D. they
The air here is not as clean as             in my hometown.
[     ]
A. this
B. it
C. that
D. its
The color of the skirt is different from _____ of mine.
[     ]

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

用所给单词的适当形式填空。
1. ______ (this) are my books.
2. Her ______ (watch) are old.
3. I know the two ______ (run).
4. Mike often ______ (have) hamburgers for breakfast.
5. Here ______ (be) some chicken.
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