Do you know why?A.你知道为什么吗? B.你几岁了?
( )(1)当你向别人介绍海伦是你的妹妹,可以说: A. This is Helen B. Helen is my sister.
( )(10)Liu Tao is _________ friend. A. meB. myC. I
( )(9)Yang Ling is my_________. A. sisterB. brother C. father
( )(8)_________is my brother. A. ThisB. HeC. She
( )(7)---She ______ my friend. A. am B. is C.are