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between these two major categories is a class of materials called semiconductors. as the name implies, a semiconductor is a material with conductivity roughly midway between conductors and insulators. it is not just a poor conductor; it has two important properties. first, its resistance normally decreases with increase of temperature, while in conductors resistance slightly increases with temperature. second, the flow of current in a semiconductor may be caused either by a flow of negative electrons or by a movement of missing sites in the opposite direction. if an atom has one outer electron missing, a loosely bound electron from a neighbouring atom can jump into it, leaving behind a new vacant site; this, in turn, can be filled by an electron from the third atom and so on. the impression is as if the vacant site has moved. such vacant sites are called “holes” and since a negative electron is missing, the hole can be said to have a positive charge.

1. Gulliver (I) was born in England. 2. When he (I) was only fourteen years old his (my) father sent him (me) to Cambridge. 3. Gulliver (I) studied medicine in Cambridge for three years. 4. When he (I) left college, he (I) went on with his (my) studies and became a doctor. 5. Gulliver (I) always wanted to travel. 6. He (I) became a doctor on a ship named the Antelope. 7. On May 4, 1699, Gulliver (I) sailed from Bristol for the South Seas as a doctor on a ship. 8. When the ship crashed into the rocks, he (I) fell into the sea. 9. Gulliver (I) was swimming for a very long time, and finally he (I) walked out of the sea to a beach. 10. He (I) lay down and fell asleep. 11. When Gulliver (I) woke up, he (I) saw many small men. 12. He (I) was in the country called Lilliput.

Teacher's work is hard and responsible. Each student needs to find his own approach. The teacher should know a lot, be able to reveal the topic in an interesting way. In addition to working at school at home, the teacher has a lot of work to do. The teacher needs to check notebooks, describe lesson plans with students, and select educational material. You also need to keep a class journal, fill out diaries and arrange parenting meetings, write characteristics for students, prepare for graduation, and so on. Working with children requires talent. And, unfortunately, this talent has a low salary.