The answers to the question above would be the following ones:
- I was thrilled that my cousin was coming to stay with us: Joyous.
"Joyous" means "extremely happy" and "thrilled" means the same ("extremely happy about something")
- My heart broke when I saw the children in the hospital: Empathetic
"Empathetic" means "showing an ability to understand and share the feelings of other"
-You're so silly, you can't wear pajamas to school: Playful
"Playful" means "fond of games and amusement; light-hearted"
- She has no talent; she's a fool if she thinks she'll be cast in the play
"Cruel" means "extremely unkind and unpleasant and causing pain to people or animals intentionally".