Ответ:

4 Seva wasn't at the party last night.

5 Were Larissa and Olga at the library 2 days ago?

6 Nina was at the sports centre yesterday.

7 Was Sonya at the post office last week?

8 Anton and Dima weren't in the park yesterday.

9 The children were in London last year.

Объяснение:

4.Seva wasn't at party last nignt

5.Did Larissa and Olga were at the library 2 days ago?

6.Nina was at the sports centre yesterday.

7.Was Sonya at the post office last week?

8.Anton and Dima were not in the park yesterday.

9.The children were in London last year.