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lethuphuongnhan
2 năm trước
Rút gọn các biểu thức sau 1) –5x(x - 3)(2x + 4) – (x + 7)(x- 3) + (5x – 2)(3x + 4) 2) (4x – 1)(3x + 1) – 5x² (x – 3) – (x – 4)(x – 3) – 7(x² - 2x² + x -1) giúp mik với mn ơiiiiii
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Exercise 12. Choose the word or phrase among A, B, C or D that best fits the blank space in the following passage.        Rescue robots (1)  hi-tech toys, but we are now using more robotic planes, helicopters. We can use them after storms, earthquakes, or fires to provide us with important (2)               . They have cameras and microphones that help rescue workers understand how much damage (3)                    and (4)       where the victims are. These planes work (5)            between 30 and 120 metres in the air and they can rescue people in somewhere very dangerous. 1.   A. look                     B. look like                      C. looks like        D. look at 2.   A. information              B. newspapers                            C. ideas              D. thing 3.   A. there                   B. it was                            C. there has        D. there is 4.   A. find                      B. find out                      C. finds               D. finds out 5.   A. much                   B. more                            C. the best                   D. best Exercise 13. Choose the word or phrase among A, B, C or D that best fits the blank space in the following passage.        Last month Lan's father (1)               her to a glass factory. They visited the recycling workshop where the broken glass was smashed (2)                    small pieces, and the glass was washed with a particular detergent liquid. After that, it was dried up and mixed (3)          some chemicals. The mixture was put into a very (4)          temperature furnace to melt into liquid. The workers in the factory used long pipes (5)            the liquid into a variety of shapes. All the glassware looks nice. Lan was very impressed by the journey. 1.   A. asked                   B. took                            C. told                D. gave 2.   A. under                  B. into                            C. in                    D. on 3.   A. in                          B. of                                C. up                  D. with 4.   A. high                     B. strong                            C. low                D. weak 5.   A. change                B. to make                        C. to blow                  D. to have Exercise 14. Complete the passage with the words given in the box.       waste             surprised         resources          recycling                ton          labor               thrown           discussion          requires          preserved                 Ba's class has a (1)                on waste paper. His friends are so (2)                      to learn that every day throughout the world, millions of newspapers and paper bags are (3)                             away. People are collecting waste paper and (4)                it. Making paper (5)                                    a lot of trees and labor. Now if people don't (6)                                      paper, they can save (7)                                        and money. Especially, people can save the natural (8)                            . For every (9)                               of recycled newsprint, ten trees can be saved. The more paper people save, the more natur

Exercise 10. Complete the passages with the words from the box. what        recycled        protect       later     throw         waste      reuse       natural How people can help with recycling?        As inhabitants of the earth we all have a duty to (1)________ the environment. We should contribute to environmental protection by finding new ways of using products we (2)________ away. Nowadays recycling is an industry. As the world’s (3)________ resources run out, manufacturers must find ways of reusing products. (4)________ can we do to help our environment? ♦    We can sort our (5)__________ by separating it and then taking it to the appropriate recycling bins. ♦    We can (6)__________ things such as jars and envelopes. ♦    We can buy (7)__________ products like stationery. ♦    We can transform our waste food into a fertilizer which we may use as compost for our gardens (8)__________       Exercise 11. Read the passage, and then fill in each blank with ONE appropriate word. produce        I would like to live in one of the (61)                      modern houses in the world. It will produce all the energy it needs from the (2)                energy, the wind energy, but not from gas, or oil. There will be modern electronic (3)  in the kitchen such as a smart refrigerator, a dishwasher, a microwave oven, and so on. The house will also have a hi-tech TV that helps us to watch TV programmes from space. A home robot will be able to do all of (4)                 , so our life will become more comfortable than ever (5)                    . 1.   A. much                   B. more              C. most              D. almost 2.   A. sun                       B. solar              C. sunny              D. cloudy 3.   A. appliances        B. tools              C. machines          D. equip 4.   A. housework              B. the housework       C. homework        D. the homework 5.   A. until                     B. after              C. before              D. then

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