Ответ:

1 He hasn't seen a UFO.

2 He has read many science fiction books.

3 Dan hasn't studied at the University of California.

4 He has worked in an international company.

5 He has earned a lot of money.

6 He has moved from England to the USA.

7 Dan hasn't climbed Mount Blanc.

8 He has met the president three times.

Объяснение: