1. Scientists' (3 - притяжат. падеж существительного) international ties (2 - множ. ч. существительного) help develop both science and friendship among people. - <em>Международные связи ученых способствуют развитию как науки, так и дружбы между людьми.</em>
2. The development of machine building determines (1 - 3-е л. ед.ч. Pr. Simple глагола) progress in other branches (2) of the national economy. - <em>Развитие машиностроения определяет прогресс в других отраслях народного хозяйства.</em>
3. High temperature influences (1) the rate of this reaction. - Высокая температура влияет на скорость этой реакции.
If you open his old photo album, you will find out that he spent his life, surrounded by beautiful pictures of nature
<span>Now they are spending a lot of money on a tour</span>
<span>Когда есть now, at the moment, Look! или Listen! и глагол вьiражает длительное действие употр. Present Contin. (to be-am, is, are + основной глагол +ing. Только в первом предложении you are looking at now- Present Cont., в других- Present Simple. :D</span>
Aleksandr Sergeyevich known Russian poet. He wrote a lot of poems, poems and children's tales. Many of his works are known all over the world such as Eugene Onegin