补全对话。

A: Hi, Jack. What are you doing?    

B: I'm              a book about animals.     

A: Oh, great. Is the dog writing a letter?    

B: No, he isn't.  

A: Is he               the bones? 

B: Yes, he is. He is hungry.

A: Where is the bear? Is he having a              ? 

B: No? he isn't. He doesn't like picnic.

A:              is he doing?

B: He is               pictures.

Teachers' advice of______stress over the school days must be grant．ed by the headmaster．

A．students to reduce

B．students reducing

C．students reduced

D．students being reduced