сформувати присудки в Past Simple або в Present Perfect (зробити в вигляді теста: цифра - присудок), 6. Complete the email with the Past Simple or the Present Perfect tense of the verb in brackets. Hi there Mom and Dad! I 1) (not/be) sure about the Summer Camp when I first heard about it, but I 2) (have) the most amazing time since I got here! And to think that it wasn’t so long ago that I 3) (pack) my bags and 4) (kiss) you goodbye! Two weeks down and three to go! Every day we have new guest speakers and the talks 5) (be) fascinating so far, at least until yesterday when Peter 6) (have) to cancel because of a cancelled flight. Our camp leaders then 7) (decide) to bring us to the laboratory, and we 8) (make) eggshell geode crystals instead. Well, you know that I 9) (do) a lot of different experiments in my life, but this one 10) (be) truly cool, and unlike my chemistry experiments gone wrong, nothing 11) (explode). The world of science sure 12) (change) a lot in the last few years! 13) (you/hear) about the discovery of water on Mars? Last August the Mars Orbiter 14) (use) an imaging spectrometer and 15) (detect) presence of hydrated minerals. This confirmed what NASA 16) (suspect)! We 17) (learn) so much about our Solar System since we first 18) (land) on the Moon and these are things that 19) (seem) impossible to study just one hundred years back! This 20) (be) such an amazing opportunity and I love every minute.

1. wasn't sure

2. have had

3. packed

4. kissed

5. have been

6. had to cancel

7. decided

8. made

9. have done

10. has been

11. exploded

12. has changed

13. Have you heard

14. used

15. detected

16. had suspected

17. have learned

18. landed

19. seemed

20. is