1. The rules explained by the teacher at the last lesson

1. The rules explained by the teacher at the last lesson (to understand) by all of us. 2. The poem was so beautiful that it (to learn) by everybody. 3. Theletter (to post) in half an hour. 4. The question (to answer) soon. 5. The book (to discuss) next Friday. 6. The article (to publish) last week. 7. The lecture (to attend) by all the students yesterday. 8. The young man (to introduce) to him fifteen minutes ago. 9. Ukraine (to situate) in the south-eastern part of Europe. 10. Kyiv (to found) more than 15 centuries ago. 11. The northern part of Ukraine (to cover) with forests. 12. The eastern and southern parts of Ukraine (to situate) in the zone of fertile steps. 13. In the South Ukraine (to wash) by the Black Sea and the Sea of Azov. 14.Coal (to use) in big metallurgical plants in Zaporizhya and Dnipropetrovsk. 15. Electronics (to develop) in Kharkiv, Kyiv and Lviv. 16. Poltava (to situate) on the banks of the Vorskla river.