C

1.this time tomorrow/ English/ They/ will be learning.

⇒ They will be learning English this time tomorrow.

2.to save/ will reduce/ our energy/ the use of electricity/ We.

⇒ We will reduce the use of electricity to save  our energy

3.in our country/ source of energy/ a renewable/ will be/ Wind

⇒ Wind will be a renewable source of energy in our country.

4. will be replaced/ Coal/ renewable source/ by another

⇒ Coal will be replaced renewable source by anther.

5. biogas/ is/ cooking and heating/ I think/ for/ abundant and cheap.

⇒ I think biogas is abundant and cheap for cooking and heating.

6. Solar energy/ in the world/ by many countries/ will be used.

⇒ Solar energy will be used  by many countries in the world.

7.because/ a non-renewable energy source/ to replace it/ Petroleum is/ it takes a long time.

⇒ Petrolium is a non - renewable energy source because it takes a long time to replace it.

8.effectively/ sources of energy/ in our country/ will be developed/ Alternative.

⇒ Alternative sources of energy will be developed effectively in our country.

10.of energy / are / the wind and the sun / Why / alternative sources / called?

⇒ Why are the wind and the sun called alternative sources of energy?

\(x-\dfrac{3}{10}=\dfrac{77}{25}\)

\(x=\dfrac{7}{25}+\dfrac{3}{10}\)

\(x=\dfrac{29}{50}\)

Khái niệm:Bàn bạc và đánh giá một vấn đề.

VD:Văn nghị luận,nghị luận 1 loài cây,nghị luận 1 đồ vật,...

\(=\dfrac{1}{2}+\dfrac{3}{4}=\dfrac{2}{4}+\dfrac{3}{4}=\dfrac{5}{4}\)

B

 Smiling happily,the mother took the baby in her arms

mất cả 2 acc mà

 I’ve never met such an intelligent boy