Which phrase expresses a strong opinion? Practise the dialogue.
KEY PHRASES Exchanging opinions
It should definitely...
What do you think?
I can't really decide, ...
I suppose ...
Do you agree?
I'm not sure about that.
I reckon we need ...
You might be right.

Humans are fighting against the pollution of the earth, but how can they remove dirt if they are polluted themselves?

Nowadays more and more kinds of food are being produced. The fact is very sad, but here and there food is created synthetically. You can hardly find anything organic on a supermarket shelf.

If one wants to stay healthy, he needs to pay attention to the ingredients listed on the back of the package in small lettering. If a certain product has some ‘E’s , then it is not organic and it would not be smart to buy it.
Of course products without a packaging like fresh fruits and vegetables are a lot more safer to eat.
The most important rule that I personally follow is drinking a lot of water every day.

Good luck! Mind that small lettering on the back of the package and stay healthy!

Alexander Graham Bell was born on March 3, 1847 in Edinburgh (Scotland).One day he came to the idea of creating a device by means of which "would be possible to transmit different sounds, if I can cause fluctuations of the current corresponding to the fluctuations in the density of the air, which produces this sound." In parallel, Bell worked on the problem of simultaneous transmission of several telegraph messages on one wire, and pure chance to experiment with them to set up a "musical telegraph" helped him discover a phenomenon that led to the invention of the telephone.February 14, 1876 Bell and simultaneously with the inventor, I.Grey filed a patent application on the invention of the telephone. The patent was issued to Bell March 7, 1876, but only in 1893, after many trials the US Supreme Court allowed the priority dispute in his favor.Among other inventions Bell - improvement of Edison's phonograph, the use of flexible aileron with rigid bearing surface for the flight control of the aircraft. Bell has published more than 100 articles and received 30 patents.He was awarded the A. Volta, established by Napoleon, and in 1877 was awarded the Legion of Honor. Bell died near Baddeck August 2, 1922.