—Is the man in blue our headmaster?
—It _____ be him. He has just left for Beijing.  

I’d like to go abroad for further study, but I _____afford it.      

—Could you please tell me the way to the station?        
—Sorry, I’m a stranger too. You ______ ask the policeman over there.        

—You _____ be very tired after the long flight.        
—Yeah, though I am tired, I feel excited and happy.            

I can play basketball, but my sister _____.

-Will you go to the party with us?              
-I'm not sure, I ___ go to visit my grandma with my cousin.              

-_        I finish my homework today, Mum?              
-No, you _         . You can do it on Saturday.              

This dictionary mustn't _____ from the library. Youcan only use it here.     

—Where is Tom? I can't find him.        
—He ________in the classroom now.          

用情态动词can， may， must的适当形式填空。
1.  —What _______ I do for you?
     —I want some apples.
2.  My father _______ride a bike, but he _______ drive a car.
3.  You are ill,  Tom.  You _______ see a doctor.
4.  Children_______play football in the street.
5.  If you are not careful ,a car _______ hit you.
6. —_______ I come in?
    —Come in, please.
7. A blind man(盲人)._______ see anything.
8.  Please ask the policeman, for he_______know the way to the hospital, I'm sure.
9.  -May I use your telephone?    -No, you_______.