1. I'm afraid I (not/be) able to come tomorrow.

 =>Won't be 

2. We (turn off) the music because people are sleeping.

=>Turn off

3. In my opinion, she (not/pass) the exam.

=>won't pass

4. They (arrive) at 6.pm tomorrow.

=>arrive

5. He (not buy) the car because he doesn’t have enough money.

=>doesn't buy

6. I (meet) my friends next Sunday.

=>meet

7. We (wear) politely when we go to the pagodas on New Year’s Day.

=>have to wear

8. On New Year’s Day, you (not break) things or you will get bad luck.

=>Don't break

9. You (finish) your homework before going to school.

=>must finish

10. My father (repaint) our house to welcome Tet.

=>It going to repaint