4. It can cause harm to trees, animals, fish and other living organisms.

5. They can include lung cancer, heart disease and other health problems

I.

1. been playing the piano since he was 6

2. hot water that I can't drink it

3. bad cold, he went to work

4. read books than watch TV

5. is said to be the breadwinner in her family

II

Nowadays a lot of people use the Internet because of its positive advantages. First, the Internet is a useful source of information. We can search for information about news, articles or weather forecast, which is really convenient. Second, it is a source of entertainment. We can listen to music, watch movies or play games thanks to this amazing invention. Morever, it is also a means of education. Online schools and online lessons can be organized for learners all over the world to obtain the knowledge they need. In conclusion, the Internet has so many benefits and we should make full use of it.