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Ответ:

*number 12:

1. do – did (or has/have i don't shure)

2. drink – today.

3. see – saw.

4. eat – ate.

5. give – gave.

6. leave – left.

*number 13:

1. Have you ordered yet?

2. Mum has cooked dinner.

3. I'm thirsty! I haven't drank anything since this morning!

4. Have you ever ate lobster?

5. I haven't saw Lucy today.