15. haven't finished

16. Have Tom participated in "Green Summer"...

17.took...

18. Where did you and your family spend your last summer vacation.

19.will...

20. It takes her 20 minutes to do to school...

21. What will your mother do...

22. What will you and your family have for dinner tonight

23. Where will you and your family go this summer

24. This evening we will not work on our school project. We will play computer games

25. does

26. are going to watch

27. am going to help...

28. are going to prepare 

29. are going to visit 

30. What will they do on Saturday and Sunday

IV.1 Peter's car is older than David's car

Peter's car isn't new as David's car is

2. The second calculation is harder than the first calculation 

The second calculation isn't as easy as the first calculation is

3. Your neighborhood is not as peaceful as mine

Your neighbourhood is noisier than mine

4. Lai Chau is colder than Hanoi

 Lai Chau isn't as cold as Hanoi

5. The service in shop 2 is worse than shop 1

The service in shop 2 is not as good as shop 2

6. Excuse me. Could you tell me where the hotel is?

Excuse me. How can I get to the hotel 

7.Why don't we go to the art gallery 

Shall we go to the art gallery 

How about go to the art gallery

8.Could you show to how to get to the city's Exhibition please