Дефиниция слов prescribed fire , live fuels , drought, burned, stand density , mechanisms, pathogens, agent, ecosystems, warming

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4) i (have written) to them three times, but i (have not got) any answer yet. 5) bill (has been) here since the 5th of november. 6) i (have met) mrs gordon many times this week. 7) colin, you (have already missed) very many classes. 8) i (have been phoning) diana for three hours already, but she is not at home yet. 9) i (have been working) on the computer since six and i (have not finished yet. 10) i have always wanted to make a tour of spain. 11) the telephone has been ringing for almost a minute. 12) i haven't even had coffee  yet. 13) they have been building their house for a year and a half.