Mn ơi giúp mình với ạ

1. He advised me to stop smoking immediately
d. All are correct
2. She suggested having Christmas dinner out
d. b or c
3. "Why don't we take a rest now?"
c. My mom suggested taking a rest then
4. "Why you passed the exam ?"
b. They asked why I had passed the exam
5. ."My students are preparing for their test"
c. He said that his students are preparing for their test