Which one is better ?
Hi

Which one better suits the blank and why?

Many products are developed each year. Light bulb, camera,
airplane, and telephone were invented by scientists and inventors.
Laptops, smart phones, and tablets were made by lots of work and
experiment. But not all products are developed by hard work.
Some inventions ...................(were created/are created) by accident or scientists’
mistakes. Penicillin, for instance, was made quite accidentally
when Alexander Fleming was working on bacteria.

And if you find any other mistakes in the text, I would appreciate if you point them out.

Thanks in advance

Question

Which one is better ?
Hi

Which one better suits the blank and why?

Many products are developed each year. Light bulb, camera, 
airplane, and telephone were invented by scientists and inventors. 
Laptops, smart phones, and tablets were made by lots of work and 
experiment. But not all products are developed by hard work. 
Some inventions ...................(were created/are created) by accident or scientists’ 
mistakes. Penicillin, for instance, was made quite accidentally 
when Alexander Fleming was working on bacteria.

And if you find any other mistakes in the text, I would appreciate if you point them out.

Thanks in advance

Answer

Many new products are developed each year. Light bulb(s), camera(s), 
airplane(s), and telephone(s) were invented by scientists and inventors. 
Laptops, smart phones, and tablets were invented after countless of hard work and experiments. However not all products were developed by hard work. Some products were discovered by accident. Alexander Fleming discovered Penicillin while he was working on a strain of bacteria.

Answers · 1

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