Ответ:

1. She has already washed the dishes.

2. They have just cleaned their teeth.

3. My cousin has not found his book.

4. Mike has already done his homework and now is playing in the yard.

5. We have just had 3 lessons of Maths!

6. Our class has visited the Kremlin lately.

7. Susan has made a tasty cake for her birthday.

8. Jack has already drunk his tea.

9. We have already learnt a lot of English words.

10. He has just listened to a new song.

11. My friend has never been to London.

12. This is a book I have never read.