根据上下文填空。
（1）A: Hello!                              
B: Hello!                                     
A:                                       
B:       hungry.       I       a cake?   
A: This        is        you.
（2）A:         this?      
B: It’s a clock    
A:         the     ?
B: It’s 7:30.
（3）A:        your pencil case?
B: No,             
A:       open the pencil case.
B: All right.