Read the following text to decide which answer best fits each numbered blank

Solar power can be (1)_______by using collector panels to create conditions that can be turned into a kind of power. Nowadays, many people use solar power systems to provide hot water, cooling capacity and supplement electric use in their own houses. The (2)________ with solar energy is that the direct power of the sun is not long enough to generate usable power all year around.

Wind power is becoming more and (3)________ popular in the world. By using large turbines to turn available wind into energy to generate electricity.

Scientists take advantage (4)________ rise and fall of tides to convert the energy of incoming and outgoing tides into electrical energy. Tidal energy is one of the renewable source of energy and produce large energy even when the tides are at low speed. This type of energy is used in (5)______ areas. However, there are some drawbacks of tidal energy. People must invest a lot of money in this process.

1. A. collected         B. collect          C. collects            D. collecting

2. A. Problems        B. problem        C. solution           D. solutions

3. A.less                  B. much             C. more               D. fewer

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

5. A. Coast              B. coasts           C. coastally          D. coastal

Read the following text and decide which answer best fits each numbered blank Nowadays, many people (1)_______prefer a life in the urban areas because of advantages such as: job, career, entertainment, good education, and better living standard. However, traffic jam is a negative aspect (2)______living in big cities. Traffic congestion is a big problem for citizens living in the city. The (3)______ reason is that people use more cars, motorbikes, poor road management, and poor quality of the roads. The chance of congestion has also increased because of the number of cars rising. Its why there is less (4)________ in smaller towns and villages. The lack (5)______ proper infrastructure is another reason. The city roads dont expand along with the increase of cars. Employers can also play an important role in dealing with congestion. People have to (6)________ with congestion when people travel to and from work. In conclusion, people should invest in more public transport options (7)_______ improve infrastructure in the incidence of congestion which would decrease (8) ________ major cities.

1.A. will B. would C. wouldn't D. won't

2.A. in B. about C. on D. of

3.A. tall B. main C. thin D. high

4.A. congestion B. congestions C. congests D. congest

5.A. with B. to C. of D. on

6.A. faced B. facing C. face D. faces

7.A. and B. or C. but D. then

8.A. on B. at C. with D. in

Give the correct form of the word in brackets to complete the following sentences.

1. By the first years of the next century, everyone (not use)_________motorbikes.

2. Poverty (be)______ a big problem of developing countries.

3. At this time next month, she (relax) ________ on the beach with her close friends.

4. Traffic accidents will be (prevent)________ if people drive more carefully.

5. It is unpleasant to (move)________ in crowded areas.

6. At 9 a.m. tomorrow, my father (go)_________ on a trip to Europe.

Rút gọn biểu thức:

a) A= \(\left(x-y\right)^2+\left(x+y\right)^2\)                             b) B= \(\left(2a+b\right)^2-\left(2a-b\right)^2\)                c) C= \(\left(x+y\right)^2-\left(x-y\right)^2\)                             d) D= \(\left(2x-1\right)^2-2\left(2x-3\right)^2+4\)