An interjection expresses an a sudden remark. "Ouch" is the interjection.
2. They ought to have thought of that sooner.
3. Children, would you like me to make something special for dinner tonight?
4. Robert could have forgotten to post the letter.
5. Excuse me, could I have a look at your newspaper?
6. They weren't able to finish the exercise because they didn't have time.
7. Mobile phones must not be used on the plane.
8. Richard can't have stole your camera.
Explanation:
altruistic means having or showing an unselfish concern about the welfare of other
ambivalent means having or showing simultaneous and contradictory attitudes or feelings toward something or someone
