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7. Q : Had the World Trade building collapsed?

N : The World Trade building hadn't collapsed.

8. Q : Is the boy sneezing?

N : The boy isn't sneezing.

9. Q : Does he work hard everyday?

N : He doesn’t work hard everyday.

10. Q : Must Pom invite Toom to her party?

N : Pom must not invite Toom to her party.

Exercise 2

1. Work harder.

2. Don't close the door.

3. Read loudly.

4. Don't smoke in this room.

5. Shut the window.

6. Visit your parent.

7. Do your homework.

8. Give me that pencil.

9. Cook Thai salad.

10. Turn the light off.