听对话，找出问题的正确答案。
（1）A．We can see three signs．   
B．We can see four signs．
C．We can see more than three signs．
（2）A．At seven o'clock．     
B．At six forty-five．
C．At seven fifteen．
（3）A．Lucy is swimming with the other boys．
B．Alice is running with the boys．
C．Nancy is singing with the other boys in the classroom．
（4）A．He doesn’t know the old man over there．
B．He knows her a little．
C．He knows him a little．
（5）A．Yes，they are．  
B．No，they aren’t．  
C．Sorry，we don’t know．
（6）