$XII$

1. began

2. has written

3. won't agree

4. went

5. aren't working

6. was destroying

7. have worked

8. isn't sell

9. to go

10. watching

$XVIII$
1. If you are calm, you won't make a wrong decision.

2. Vietnamese people use Khue Van pavilion as a symbol of Hanoi.

3. His idea is not the same as me.

4. What food do you like?

5. These machines are used by chefs to mix the ingredients

$@bangtann $

1. began

2. were writen

3. won't agree

4. went 

5. aren't working 

6. were destroyed 

7. have worked 

8. isn't sold

9. to go

10. watching

Ex2

1 These wonderful poems were writen by a great poet

2. Vietnamese people use Khue Van pavilion as a symbol of Ha Noi

3. His idea isn't the same as mine

4. Those modern paintings aren't as expensive as these Dong Ho painting

5. What food do you like?

6. These machines are used to mix ingredients by chefs