1)Our mother ... just (to make) coffee.
2)Linda ... (not to meet) him yet.
3)Forest fires ... (not to occur) in the area since last year.

Нужно Open the brackets using Present Perfect.

Dear John,
Sorry for not answering, I was really busy with my homework. Thank you for your letter, I was really happy to hear from you again.
Well, as you know, i went to London with my parents last week. Our journey was absolutelly breathtaking! We lived in the hotel near Big Ben. We went to a guided tour. It was really exciting to meet historical places of the city. Moreover, we went sightseeing. We also visited different squers, parks and museums and met with local culture.
Sorry, I have to go now. My dad is calling me.
Keep in touch!
Yours,

this summer me and my friends decided to visit usa. i was so exited about this journey,and even afraided to miss the plane or forget the passport or ticket at home. so the flight day came and i packed my luggage and took my boarding card. There was a traffic jam on the wat to the airport but i catched my plane. I gave my tickets to the check-in assistant,go to the upsatirs on the escalator and find my way on the plane. In the plane there was a friendly and nice flight attendant. The plane took off and the flight was smooth and easy all the way to usa. It landed in usa at 5'o clock. I got off the plane and started my trip. But that's another story to tell:)