More than one form can be correct.

1. _____________ I close the door?

   1.   ?    can
   2.   ?    may
   3.   ?    might
   4.   ?    could

2. My brother ____________ speak English very well.

   1.   ?    might
   2.   ?    may
   3.   ?    could
   4.   ?    can

3. Teacher, _______________ you step aside, please?

   1.   ?    must
   2.   ?    should
   3.   ?    may
   4.   ?    could

4. The café _________ be already closed, i`m not sure.

   1.   ?    might
   2.   ?    should
   3.   ?    must
   4.   ?    could

5. John, _____________ you help me, please?

   1.   ?    can
   2.   ?    may
   3.   ?    mght
   4.   ?    should

6. You ____________ respect old people!

   1.   ?    may
   2.   ?    should
   3.   ?    can
   4.   ?    could

7. Drivers ______________ stop when the traffic light is red!

   1.   ?    can
   2.   ?    could
   3.   ?    should
   4.   ?    must

8. Children ______________ sleep 12 hours a day.

   1.   ?    must
   2.   ?    can
   3.   ?    should
   4.   ?    might

9. Look at those jewels! She _____________ be very rich!

   1.   ?    may
   2.   ?    can
   3.   ?    must
   4.   ?    should

10. _____________ I borrow your pen?

    1.   ?    should
    2.   ?    can
    3.   ?    may
    4.   ?    might