I/

1. Their work will be finished soon.

2. Because the car was beautiful, I wanted to buy it.

3. If I had Tom's number, I would phone him.

4. Although she is not well, she goes to school.

5. Although the room is very small, it's quite comfortable.

7. I used to stay up late to watch football matches last year, but now I don't.

8. Thu had a temperature, so she didn't come to Mi's birthday last night.

9. Those shoes are theirs.

10. My school is not as big as hers.

11. My book is not different from yours.

12. Lan can't sing as well as Mai.

13. Your bike is not as expensive as mine.

14. My grandfather is older than my grandmother.

15. My father used to go to work by car some years ago, but now he cycles. 

16.  It's about 2 kilometers from my house to my school.

17. Now there are more traffic accidents than before.

18.  In spite of being  tired, they had to do the housework.

19. Less electricity will be used in the future.

20. Solar panels will be installed on the roof of our house next week.

21. Flying cars won't be used until the year 2050.

$\tiny -T-$

I, Rewrite:

1, The work will be finished soon.

2, I wanted to buy the car because it was beautiful.

3, If I have Tom's number, I will phone him.

4, Although she is not well, she goes to school.

5, Although the room is very small, it's quite comfortable.

6, I used to stay up late to watch football matches last year, but now I don't.

7, Thu had a temperature so she didn't come to Mi's birthday last night.

8, Those shoes are theirs.

9, My school is not as big as hers.

10, My book isn't different from yours.

11, Lan can't sing as well as Mai.

12, Your bike is not as expensive as mine.

13, My grandfather is older than my grandmother.

14, My father used to go to work by car some years ago, but now he cycles.

15, It's about 2 kilometres from my house to my school. 

16, Now there are more traffic accidents than before.

17, Inspite of being tired, they had to do the housework.

18, Less electricity will be used in the future.

19, Solar panels will be installed on the roof of our house next week.

20, Flying cars won't be used until the years 2050.