trong các số 5 8 9 12 13 15 có mấy bộ ba số  là độ dài các cạnh của tam giác vuông

     IV. Write the correct form of the words in brackets.

          1. Solar, wind, and hydro are renewable and _______________________                               (exhaust)

          2. Geothermal is also ____________. However, it distributes unequally on Earth                     (abundance)

          3. The movement of waves anf tides can be able to generate_______________                       (electric)

          4. Scientists are looking for clean and_____________sources of energy.                                  (affect)

          5. Non-renewable sources are not______________friendly and can have serious effect on our health.  (environment)

          6. Natural gas is less_______________than coal or crude oil.                                                    (pollute)

          7. Energy resources are often _____________as renewable or nonrenewable.                        (category)      

          8. Turning off electrical appliances when they are not m use is a great way to reduce energy __________ (consume)

          9. The burning of fossil fuels is _______________ to the environment and public health. (harm)

         10. Solar power is by far the most popular ___________________ energy source.                (new)

    III. Complete the sentences with the future continuous form of the verbs in the box.

1. Next Tuesday at this time I ____________________ on the beach. I can’t wait!

2. We ___________________________ outside the cinema at 7.30. See you then!

3. All tomorrow afternoon the children _____________________ on their history project.

4. This time next week my sister ___________________ at her new school.

5. Don’t phone grandma at 9.00 because she __________________ her favorite TV program then.

6. In two years’ time, I expect I ___________________ in my own flat.

7. This time tomorrow we ______________________ the plane to Brazil.

8. Tonight at eight o’clock, I ___________________ dinner with my parents.

9. It’s 3.30. Christ ____________________ to the football so we’d better not ring.

10. In a few years’ time most people _________________________ electric cars or hybrid cars.

       I. Change the sentences into the passive voice.

1. The government will bring electricity to remote areas next year.

    _________________________________________________________________________________

2. We will solve the problem of energy shortage by using solar energy.

   _________________________________________________________________________________

3. The government will build a new hydropower plant to meet increasing demand.

  _________________________________________________________________________________

4. In the coming decades, we will use renewable energy every day.

 _________________________________________________________________________________

5. Will we use up all the world’s oil in the next 100 years.

_________________________________________________________________________________

6. They will place solar panels on the roofs of houses to produce hot water and electricity.

_________________________________________________________________________________

7. Alternative energy sources won’t replace coal, oil, and gas anytime soon.

_________________________________________________________________________________

8. Will renewable energy completely replace fossil fuels in the future?

_________________________________________________________________________________

9. Will solar and wind energy use instead of fossil fuels within 20 years

_________________________________________________________________________________

10. People will use biogas for fuel in homes and for transport

_________________________________________________________________________________

It is predicted that there will be a serious _____________ of energy in the future. (short)

  . Renewable energy is an __________ source of energy. It is unlimited.                         (exhaust)

  . One of the ______________ of wind power is that it is unavailable.                           (advantage)

   . Will ______________ energy sources be banned from using in the future?                  (new)

tìm giá trị nhỏ nhất của biểu thức E = 5-3x/4x-8 (x E Z/ x ko = 2

Câu 1: Cho hai đại lượng x và y tỉ lệ nghịch với nhau, biết x = -2/3 thì y =1/2. Hỏi hệ số tỉ lệ nghịch của y theo x là bao nhiêu ?

A. - 3/4   B -1/3. C. -4/3    D. -3