5. We (do) a lot last Sunday.
6. I sometimes (go) to the cinema.
7. Nick (work) hard yesterday.
8. I (find) my ring yet which I (lose) at the party yesterday.
9. They (build) this castle in 1762.
10. Would you like to have something to eat? No, thank you I (just have) dinner.
11. Sue (get) up at 6 o´clock every day.
12. Look! Sue (run) down the street.
13. This house (cost) 35.000 pounds in 1980.
14. Cats (catch) mice.
15. you (meet) Bill yesterday?
16. When he (arrive), we (have) dinner.
17. he (already arrive) in Los Angeles?
18. I (see) him since last Wednesday.
19. Father (smoke) his pipe while mother (prepare) lunch.
20. Look, it (snow)

ответ:5 did 6 go 7 worked 8 didnt work 9 built 10 have just had 11 gets up 12 is running 13 costs 14 catch 15 did you meet 16 arrived we were having 17 has he arrived 18 havent seen 19 was smoking... was cooking 20is snowing

Объяснение:

Dear tony, thank you very much for your letter. it was great to hear from you. in your letter you ask me to tell you  about my well, i was born on the 6th of december, that is in winter and i can't go on a picnic on this day because the weather is usually very cold in december in our region. though   sometimes if the weather is rather warm we can go to  ski or skate with my friends. usually i invite my classmates to come to my birthday    party which we arrange at home. we have fun joking and laughing,  talking, dancing, listening to cds and, of couse, eating tasty food and a delitious birthday cake.  sometimes we go out to a cafe with a few friends of mine or with my family.  as for the present for my next birthday i would like to have а small puppy.  well, i must finish now. keep in touch. best wishes, alex