Для K, Ba, Al составить по 4 формулы соединений с одним из неметаллов IV, V, VI, VII групп.

Thank you for your letter. It was so nice to hear from you! My summer holidays were also interesting. In June I went to the country. I (spend) a month at my dacha. I rode my bike and played with my friends. It was warm but it often rained in June. So we didn't (swim) in the lake. But we went fishing. Once I (catch) a very big fish and we (have) a tasty dinner. Sometimes my granny and I (pick) berries in the forest. In July, my parents and I went to the sea side. We (do) a lot of sunbathing and enjoyed the sea. I (not\miss) my school friends. I just didn't have time! ... you(take) any pictures at the camp? Will you send some of them to me?