1. I just (am walking, have walked) through the field. 2. Why is your hair wet? It is wet because I have just (swam, swum) in the river. 3. What team (won, has won) yesterday? 4. We (have chosen, chose) this pair of shoes. 5. (Choose, have chosen) any cup you like. 6. This team often (loses, has lost). 7. Yesterday Ann (swam, was swimming) for two hours. 8. The wind (has blown, blew) off the man's hat, and he can't catch it. 9. The weather (has changed, changed) and we can go for a walk. The wind (has changed, changed) in the morning. 10. Wait for me a little. I (am eating, have eaten) my breakfast now. 11. Nick (is writing, has written) a letter. When he finishes, we shall go to the post office. Нужные времена
Global problems of mankind - problems and situations which cover many countries, Earth atmosphere, the World Ocean and a circumterraneous space and mention all population of Earth.
Global problems of mankind can't be solved by forces of one country, in common developed regulations on the environmental protection, the coordinated economic policy, the help to the backward countries, etc. are necessary.
Everything is interconnected with everything - the first ecological law says. Means, and a step it is impossible to step, without having touched, and at times and without having broken something from environment. Each step of the person on a usual lawn are tens ruined microorganisms, the spugnuty insects changing migratory ways or maybe reducing natural efficiency.
Last century there was an alarm of the person for destiny of a planet, and current century business reached crisis of world ecological system because of renewal of loads of environment.
Global problems of the present — set of problems of mankind on which decision social progress and civilization preservation depends.
What is the global problems? It would seem, the question is clear long ago, and their circle was defined still in the early seventies when the term "global studies" started to be applied, there were first models of global development.
One of definitions carries to global "the problems resulting objective development of society, creating threats to all mankind and demanding for the solution of the combined efforts of all world community".
Correctness of this definition depends on what problems to carry to the global. If it is a narrow circle of the highest, planetary problems, it quite corresponds to truth. If to add here such problems as natural disasters (it is global only in sense of possibility of manifestation in the region), then this definition appears narrow, limiting in what its sense consists.
Advantages and disadvantages of TV.
TV has good and bad sides. First of all it keeps people informed, we can learn a lot of information watching TV. We can choose programs that appeal to us more, because TV provides programs for all interests. Sometimes we can relax, entertain ourselves when we are tired. Advertisement on TV gives us information about different products and it makes easier to choose things to buy. When we watch TV we learn about the world, famous people and global or recent news.
But TV has a lot of disadvantages. It takes a lot of time and it makes us lazy. And it’s very harmful for our health, especially eyes. Some violent programs and films make people violent. Violence becomes a vital problem. There is too much advertisement on TV. Sometimes it can encourage us to buy things we don’t need at all. Watching TV takes most of free time of almost all people. We just watch it, we do not concentrate, and, finally, we waste time.
In my opinion people need something like informational center. As for me I watch TV about one hour a day. I watch it when I want to learn news or relax and entertain myself. People need TV, but it can’t be the main thing in their life. It’s interesting, but not the main thing in our life.
I don’t really know what we must do to make TV better. I think we can do nothing. We just should not sit hour by hour watching TV. I think we must watch only the most important and interesting things. Because if we see everything we’ll become mad.