Teachers all （） the student to enter the competition.

单项选择题Letushavesomethingicedtodrink，（）

A. will we              
B. shall we    
C. do we               
D. don’t we

单项选择题We（）tennisintheparkwhenyouphoned.

A. must have been playing      
B. must be playing   
C. must play             
D. must have played