1 . I often hear the song ________ by my neighbor, but I never hear my mom ________ it.(sing)（用适当的词填空）（所给词的适当形式填空）

2 . In this way, practicing day in and day out helped Stephen s ________（磨练）his skills. （根据中英文提示填空）

4 . I heard that Mary sang a song in the next room last night. （句型转换）
→__________________________________________.

5 . What he wants is _______ his mother as quickly as he can; and what he must do is ____ to the hospital at once.

A．to see; going	B．to see; go
C．see; to go	D．see; go