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.