Science has been developing too much for a long time. Although it ( ) gives us ( ) convenience and solves many problems which had not been proved in science there are still many things the science cannot demonstrate what they ( ) are. One of those ( ) things is some superstition. I firmly believe some phenomenon cannot be accepted by means of science. Mysteries exist in everywhere.
à English essays should be reader-friendly, but too much use of pronouns sometime bothers readers to understand a piece of writing. Now, look into your pronouns and figure out what those pronouns are replacing.
Although it gives us convenience and solves many problems which had not been proved in science there are still many things the science cannot demonstrate what they are.
à The above sentence is too long and it has several ideas. Can you break this down into more than three sentences?
** Hopefully this gives you ideas of how to start your English writing.