根据问句，选择适当的答语。(20分)
( )（1）What are you doing?
( )（2）What is Sam doing?
( )（3）What is she doing?
( )（4）Are you writing a letter?
| A．She's taking pictures. | B．I'm talking to my friend. |
| C．He's playing with his car. | D．No, I'm not. |
I'm ________ TV.
A．watchB．watches C．watching
I'm doing ________ homework.
A．me B．my C．he
What are you ________？
A．doing B．do C．does
I'm listening ________ the radio.
A．/B．forC．to
