Ответ:

  1. You must wear a seatbelt — it’s the law.
  2. Can I use your pen for a moment?
  3. She may be at the library; she usually studies there on Tuesdays.
  4. You should see a doctor if the pain doesn’t go away.
  5. May I go to the party on Friday?
  6. You have to submit your assignment by Friday.
  7. You must try this dish — it’s delicious.
  8. He must be tired after working all night.
  9. Can I borrow the newspaper?
  10. She might be at home; her car is outside.

Ответ: 1 — must; 2 — can; 3 — may; 4 — should; 5 — may; 6 — have to; 7 — must; 8 — must; 9 — can; 10 — might.