1. To a certain extent, (I agree that) the government should control the Internet. For instance, a reasonable period of time of access per day is allocated to children users, so as to avoid them playing too many games. Do not let the children be addicted to Internet.
2. Governments should set a series of regulations or rules to control the pollution, such as to encourage people to report illegal manufacturers or factories that pollute the environment.
3. I think (that) the paper-printed articles, such as newspapers, magazines or books, will eventually not disappear because there are always some people who enjoy the atmosphere or the feeling of holding something to read, especially during the leisure time or (at night) before sleeping.
Sentence 1: "To a certain extent, yes." -- Any audience who came to this point might possibly ask, "Yes, of what?" Thus, it is suggested to use this kind of structure mainly after a "yes/no" type of question.
Sentence 2: "To encourage people to report illegal manufacturers/factories that pollute our environments." -- This is a sentence fragment, as it does not contain any main conjugated verb within the full-stop (period). One needs to bear in mind that for a general sentence, there exists solely ONE main conjugated verb (or auxiliary verb).
Sentence 3: If the abstract noun "books" is considered one type of the paper-printed articles, using it as an example of "holding books to read" will become unfair to other similar paper-printed articles. Therefore, it is substituted by "something" to be more general.
I wish you a good day.／祝 是日安好。