One thinks that life is difficult the other knows how to live a living
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.
Watching me suspiciously is the participial phrase. They give information as to what the kitten is doing.
I think the answer is d because u combine the details in what u read with pre-existing knowledge