Ответ:

1.Our grandmother cooked dinner yesyerday.

2.They traveled to Africa last year.

3.My friend read an interesting book yesterday.

4.They built a huge bridge last year.

5.Our new teacher inroduced herself.

6.My friend ate ice-cream and drank Coke yesterday.

7.Did you meet your parents yesterday?

8.Did they find their bag?

9.We didn't get presents.

10.He didn't leave his home yesterday.

11.Did he spend a lot of money?

12.Did your granny made a cake last week?

Ответ:

1. was cooked

2. were traveled

3. was read

4. were built

5. was introduced

6. were ate, were drank

7. were met

8. were found

9. weren't got

10. wasn't left

11. was spent

12. were made