1.Computers are harmful because many teenagers spend a lot of time sitting at the computers and spoiling their eyes. They spend much time chatting and living in virtual world. They have no time for real communication with their peers.2.Computers are great because using the Internet you get a huge base of data and knowledge, where you can find any thing you want from movies and music of interest to the vast number of books, newspapers and magazines. Today there are many different Internet - competitions for different subjects which give students the opportunity to participate even in international competitions.
1This plant have produced many components at alloys. Emergency need a lot of machine repairing tools. The year number of unemployed people is increasing.
2 Was the first calculating machine invented many years ago? What did invent many years ago? The first calculating machine wasn't invented many years ago.
Have you been to Paris many times since that? Where have you been so many times? I haven't been to Paris many times since that.
3 will have repaired generate cover died
4 was lookedwas find were made had been received have been introduced
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