读对话,完成句子。(每题2分,共10分) A:_________ are you going this afternoon? B:I am going to the bookstore. A:_____________________________________? B: I'm going to buy a dictionary. A:__________ are you going? B: I'm going at 4 o'clock. A:________ are you going there? B: I'm going there by bike. A: _________are you going with? B:I am going there with my sister.