—Whose MP5 is this, Tina?— It’s _____. My mother bought it for me last Sunday.

—Is the woman a teacher? —Yes. She teaches ________ English. 

—__________ have you been in the sports club?—Since the first month I came to the school．

 It’s my mother’s birthday tomorrow. I will buy _____ a CD as a present.

比较划线部分的读音，选出一个与其他三个发音不同的单词.