8. Even the top students in our class cant work out this problem. So it _______ be very difficult.
A may B must C can D need
9. —____ the man there be our maths teacher? —He ____ be, but I’m not sure.
A May; can’t B Can ; can’t C Can; may D May; mustn’t
10. —Don’t forget to pass this letter for me, please. —No, I _______.
11. —Would you like to go swimming with me this afternoon?
—I’d love to. But I’m afraid I _______. I have too much work to do.
A can’t B mustn’t C needn’t D may not
12. —Can you go swimming with us this afternoon?
—Sorry, I can’t. I _______ take care of my bike sister at home because my mother is ill.
A can B may C would D have to