I (WRITE)……. ….. TO MY PEN PAL TWO MONTHS AGO, BUT I (NOT RECEIVE )...

5. I (write)……. ….. to my pen pal two months ago, but I (not receive )………... his reply since then. C. READING (2, 5pt) I. Fill each of the numbered blanks in the following passage. Use only one word in each space. (1pt) was problem children example It Population growth is a serious (1)... around the world. At the beginning of the 20

^th

century, there were about 1. 5 billion people in the world. In 1984 the world population (2)... 4. 8 billion people. By the year 2000,. (3)…… will be about 6. 1 billion. This growth in population is not happening everywhere For (4)……. in Europe the population is not growing at all families in these countries are smaller now. Only about 2. 1 (5)... are born for every woman. II. Read the following passage and answer the following questions. (1, 5pt) Solar energy is a long lasting source of energy which can be used almost anywhere. To generate solar energy, we only need solar cells and the sun! Solar cells can easily be installed on house roofs, so no new space is needed and each user can quietly generate their own energy. Compared to other renewable sources, they also possess many advantages. Wind and water power rely on turbines which are noisy, expensive and easy to break down. Solar cells are totally silent and non-polluting. As they have no moving parts, they require little maintenance and have a long lifetime. However, solar energy also has some disadvantages. We can only generate solar energy during daytime because the system depends on sunlight. Besides, solar cells require large area to work effectively. The main disadvantage of solar energy is that it costs about twice as much as traditional sources such as coal, oil, and gas. This is because solar cells are expensive. Scientists are hoping that the costs of solar cells will reduce as more and more people see the advantages of this environmentally friendly source of energy.