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?