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1 Modern means of transport are efficient and relatively cheap, they are the reason we can travel almost anywhere in the world in a matter of hours. It has become possible for us to see other countries, learn about their cultures and experience their lifestyle. It sounds good but, as always, there is a downside.

2 On the one hand, traveling broadens our mind. For example, we can see historical monuments with our own eyes and learn about past civilizations. We can almost experience history by actually visiting historical places.  

3 On the other hand, we all know that cars, airplanes and trains cause serious harm to the environment. They pollute the atmosphere of our planet and make the problem of global warming even more acute. There are fewer and fewer clean and beautiful places to go to in the world

4 However, it is always possible to find a compromise. We don’t have to cross the ocean to spend some time at the seaside or to see an ancient monument. There are sandy beaches and historical places closer to home

5 Personally, I would much rather go for a walk in the countryside or enjoy a ride on my bicycle. Our country is so beautiful that I wouldn’t want to leave it even for a short time  

Объяснение:

1)Thd pipettes were already washed.

2) The theme of research was offered by his supervisor.

3)The easiest way to do it was showed.

4)The pH constant is kept by buffer.

5)This research wasn't done by Boris before his assistant helped him.

6)These engines was started by hand in the 1 century. Now they started by electricity.

7)The new research center was opened by the Primary.

Объяснение: