cs lời giải chi tiết

Chứng minh rằng: 1/3.4+1/4.5+...+1/19.20<1/2. có lời giải chi tiết

III. Read the text and choose the correct answer A, B, or C to each question.

1. Life in 100 years will be very different from now. We will travel by flying car. All we will need to do is to choose a place on a screen inside the car. Then, we will just sit and relax because the car will drive itself. The car will take us anywhere in a very short time. Traffic problems will be the thing of the past. Also, we don’t need to go to the supermarket to do the shopping. We will buy things from home with a click of the mouse on the computer. We will have holidays on others planets. We won’t have to do the housework as our robots will do all the housework for us. They will cook our favourite meals and do the washing – up afterwards.

1.   How will we travel in 100 years?

      A. By plane                    B. By train                            C. By flying car                   D. By car

2.   When we want to go to a place, we will just need to __________

      A. tell the car the name of the place.

      B. choose the place on a screen inside the car.

      C. type the name of the place on your phone.

      D. click of the mouse on the computer.

3.   We will __________ to drive our car.

      A. not need                    B. need                                 C. need someone                  D. have to

4.   Traffic jams __________.

      A. will happen                                                             B. will get worse.                

      C. will become serious.  D. will not happen

5.   How will we do our shopping?

      A. We will go to the supermarket to do our shopping.

      B. The robots will do the shopping for us.

      C. We will use the computer to do our shopping.

      D. The robots will take you to the shopping mall.

II. Read the text and answer the following questions.

1. Do you have a smart device, like a wireless TV or a hi-tech fridge? In the future, smart technology will be everywhere and it will make our lives easier. If you hate washing and cleaning, we might soon have robots to do the housework. If you don't like cooking, an automatic food machine will do it for you. You touch the screen to choose your meal and it will be ready in a few seconds. Our homes will be full of these modern machines. Our future is so great, and I can't wait for it. What about you? Do you like such a house?

1. What will make our lives easier?

       ________________________________________________________________________

2. Who might do the housework?

       ________________________________________________________________________

3. What will do cooking for us?

       ________________________________________________________________________

4. What do you do to choose your meal?

       ________________________________________________________________________

5. How is our future?

       ________________________________________________________________________

2. Hi. My name is Khanh. My favourite future house will be a green house. I want to (1) __________ it "a garden home". This house will be in the middle of the city, (2) __________ there are plants

everywhere. From the street, people will see a tall garden, but in fact, it is a house. (3) __________

are plants and trees in front of the glass walls. There is also a small garden (4) __________ the roof. You can put chairs and tables there and enjoy tea with your family in the afternoon. When you live in this house, you will feel very (5) __________ and relaxed.

1.   A. to be called                B. call                                   C. calling                              D. to call                  

2.   A. and                            B. but                                   C. so                                     D. for

3.   A. Here                          B. They                                C. There                               D. We

4.   A. in                               B. at                                      C. between                           D. on

5.   A. health                        B. healthy                             C. unhealth                           D. unhealthy

READING: I. Read the following passage and circle the letter A, B, C, or D to indicate the correct word or phrase that best fits each of the numbers blanks.

1.  Our future house will be on the ocean. It will be surrounded by tall trees and blue sea. But we only have salt water in the ocean. We needs fresh water for (1) __________ and for growing food (2) __________ farms. Ocean water is too salty to drink. It is also too salty for watering plants. We must have the (3) __________ to make (4) __________ water from salty water. We should be (5) __________ not to waste water.

1.   A. drinking                     B. drink                                C. to drink                            D. drinks

2.   A. in                               B. on                                    C. at                                     D. for

3.   A. polluted                     B. contaminated                   C. fresh                                D. salty

4.   A. things                        B. suggestions                      C. ways                                D. ideas

5.   A. careful                       B. careless                            C. carefully                          D. carelessly

PHONETICS: Choose a word that has different stressed syllable from others.

1. A. repeat                          B. surround                          C. believe                             D. happen

2. A. classmate                     B. tonight                             C. future                               D. mobile

3. A. discuss                         B. receive                             C. contact                             D. suggest   

4. A. housework                   B. correct                             C. planet                               D. solar

5. A. kitchen                        B. little                                 C. today                               D. travel

6. A. hotel                            B. bedroom                          C. picture                             D. dishwasher

7. A. window                       B. police                               C. village                              D. mountains

II. Choose the correct answers A, B, C, or D to finish the sentences.

11. A _____________ TV can help us watch TV programmes from space

      A. wiring                        B. wire                                 C. wireless                            D. wiry

12. My future house will have solar _____________.

      A. energy                       B. energetic                          C. energize                           D. energetically

13.The car of the future will run on_____________.

      A. electric                       B. electrical                          C. electricity                         D. electrify

14. My house will be on the Moon and will be large and_____________.

      A. comfort                     B. comfortable                     C. comfortably                     D. discomfort

15. The car of the future will be_____________.

      A. differently                 B. difference                        C. different                          D. differ

16. My future house will be _____________ the ocean.

      A. in                               B. on                                    C. of                                     D. for

17. With a wireless TV, we can watch TV programmes _____________ space.

      A. in                               B. to                                     C. at                                     D. from

18. Henry thinks we will stay _____________ the Moon for a short time.

      A. to                               B. for                                    C. on                                    D. at

19. You will have a car to fly _____________ space.

      A. on                              B. into                                  C. of                                     D. up

20. Will super cars run _____________ water in the future?

      A. on                              B. into                                  C. of                                     D. up