7. for 

8. from

9. at; at

10. about

11. in

12. With; in

13. in; on

14. at; of; in

15. at

IV.

1. friendly
2. orphanage
3. humorous
4. extremely
5. beautiful
6. lucky
7. peace
8. lovely
9. socially
10. different

V.

1. Thank you so much for your letter which arrived few days ago.
2. It is lovely to hear from you.
3. I am sorry that I have not written to you for a long time but I was very busy.
4. As you know, we bought a new house in September.
5. It was in very bad condition and it needed to be repaired a lot.
6. We have just finished most of it and now it looks very nice.
7. Peter and I decide to give a house-warming party on May 3^rd.
8. Do you think you are able to come?
9. Please give me a ring and let me know if you can come.
10. I am really looking forward to seeing you again.

VI.

1. Do you mind sending this letter for me?
2. I have been playing the piano for 2 years.
3. The last time I have forgone a meal was two years ago.
4. This is the first time his authority has been challenged.
5. John last did a revision in spring term.
6. He goes to work at a quarter to seven.
7. The bakery is to the left of the drug store.
8. Your room is bigger than my room.
9. This house is the oldest in the street.
10. No girl in my class is fatter than Hang.

VII.

1. C -> drinks
2. B -> was
3. D-> hard enough
4. D -> to understand
5. A -> came
6. C -> had

III/

7. for

8 from

9 at-at

10. about

11.in

IV/

friendly

orphanage

humorous

beautyful

luckily

lovely

socially

different