B
3. We are planing our holidays.
4. I am walking to school.
5. They are not running very fast.
6. The cat is drinking some milk.
7. I am not having a good time.
8. He is carrying a computer upstairs.
9. She is not working hard today.
C
2. am sitting
3. is telling
4. is showing
5. aren't looking
6. is not shouting
7. is not singing
8. is coming
9. is smiling
10. are you doing
11. are bringing