The street is very _______, which makes me difficult to sleep. A. noise B. noisy C. noisily D. noises 16. A number ________ political prisoners have been released since Independent Day. A. in B. of C. on D. at 17. Fax machine...................send or receive letters quickly. A. is used for B. used to C. is used to D. used for Identify the one underlined word or phrase - A, B, C or D - that must be changed for the sentence to be correct. 18. Could you tell me what the air conditioner is use for? A B C D 19. An electric cooker is used to cooking rice, meat, fish and vegetables. A B C D 20. If you like entertain, you can relax by playing computer games. A B C D Read the passage below and choose the best answer: In the last 100 years. technology has completely changed the way we live. At the touch of a button, we can look up almost anything we need to know on the Internet. We have electricity, aero planes. television, and we have ever been to the moon. So what sort of inventions will there be in the 21st century? Indeed. is there anything important still left to invent? It seems that there is. Scientists all over the world are looking into Nan technology with a great deal of interest. This is the science of building small machines - and when we say small, we mean very small. To give you an idea of the size scientists are talking about, these machines would be about a million billion times smaller than the smallest bit of dust. Nan technology will bring about enormous changes. Doctors, for example, will he able to cure any illness. The environment will be improved because it will be possible to take the polluted air we breathe and make it clean again. But perhaps the most exciting thought of all is that we won't have to wait a thousand years for Nan technology - many people believe there is a good chance it will come in our life time. 21. This passage is mainly about ____________ A. inventions B. Nan technology C. technological changes D. small machines 22. According to the passage, _____________ A. our lives have been changed by technology B. we can use the Internet to get information C. we have been able to travel to the moon D. All are correct 23. Nan technology is_____________ A. the skill of building very small machines B. the science of building computers C. the new computer technology D. the recent advance in medical technology 24. Which change will Nan technology not bring about? A. Fatal diseases will be cured. B. The air will be warmer. C. The pollution will be reduced. D. The environment will be protected. 25. Which of the following is NOT true? A. Scientists have a lot of interest in Nan technology . B. The size of the machines will be much smaller than the smallest bit of dust. C. Nan technology will bring about some changes in the medical field. D. Many people believe that they have to wait a thousand years for Nan technology.