Здравствуйте Задание 8.3. Вставьте подходящие по смыслу союзы и предлоги.
Of, by, in, about, as well as, and, on
1. Scheele ... Priestley obtained ... oxygen ... heating various compounds ... the element. 2. Priestley recognized that the gas obtained ... him plays an important role ... combustion. 3. Priestley ... Scheele remained adherent... the phlogiston theory... combustion. 4. The combustion... a substance consists ... its combination with oxygen. 5. Oxygen occurs ... the free state ... the atmosphere.

1. On the street a few machines. 2. In the movies many movies. 3. In a cafe a lot of food. 4. On the beach a few people. 5. In the store a lot of juice. 6. The country has many problems. 7. In the little pool of water. 8. Near the village, many lakes. 9. In the Museum few tourists. 10. On the table a lot of paper. B. 11. In new York a lot of expensive shops. 12. The hotel has many English tourists. 13. In the shop a lot of cheap food. 14. Opposite the school is small beautiful flowers. 15. Behind the house is a lot of garbage. 16. In the city a little fresh water. 17. In the village a lot of good people. 18. In a cafe a lot of high tables and chairs. 19. The album has few new photos. 20. In the fridge a little Apple juice.

Начну с того, что в наше время мы не представляем себе жизнь без компьютера и мобильного телефона. 

С одной стороны, пользоваться мобильным телефоном очень удобно. Во-первых, это важно для безопасности, потому что родители могут связываться со своими детьми в любую минуту. Во-вторых, мобильный телефон это маленький компьютер у вас в руках. Вы можете звонить друзьям, отправлять сообщения, участвовать в чатах и много другое. 

Но с другой стороны, использование мобильного телефона очень вредно для здоровья детей и взрослых, поэтому пользование им должно быть ограничено. Кроме этого, учителя часто жалуются что телефон отвлекает студентов на уроках. 

В заключение хочу сказать, что я не против мобильного телефона вообще, но считаю, что пользоваться им нужно в пределах необходимости.

 

To begin with, nowadays  we cannot imagine our life without a computer and mobile phone. On the one hand, using a mobile phone is very comfortable. 
First, it is important for security, because parents can communicate with their children at any moment. 
Secondly, the mobile phone is a small computer in your hands. You can call friends, send messages, participate in chats and do much many useful thing. But on the other hand, the using a mobile phone is very harmful to health of children and adults, so its using should be limited. 
In addition, teachers often complain that phone distracts students in the classroom. The phones are very different in color and size, but the same form. They are made of different material, so they are expensive and not very expensive.  
In conclusion, I would like to say that I am not against mobile phone at all, but I think that they must be used only if they really need.