Помогите, пожалуйста, привести 3 условия применения Закона Кулона

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Раскройте скобки, употребляя глаголы в Present Perfect или Past Simple .

1. While travelling in the Crimea, I (to meet) your friend.

2. I never (to visit) that place.

3.He (to visit) that place last year.

4. I just (to get) a letter from Tom.

5.You (to take) any photographs while travelling in the south&

6. He (to be) abroad five years ago.

7.You (to be) in the Caucasus last year?

8.They (to leave) England when he (to be still a child.

9.He 9not yet to come) back.

10. He (to go) already?

11.When you (to see) him last?

12.I (not to see) him for ages.

13. His health (to improve) greatly since I (to see) him last

14. You (to pass) your driving test yet?-Yes, I (to pass) it in May, but I (not to buy) a car yet.

15.He already (to move). he (to find) a nice flat before Christmas and he (to be) there two years.