The main source of energy at present is fossil fuel.

Some alternative sources of energy are wave energy, solar energy, biofuels, natural gas, geothermal power, wind energy, biomass energy, tidal energy, hydrogen gas, etc.

Their advantages are that they are renewable and is most likely to never run out. Also, they are easier to find than fossil fuels. They produce little or no waste that is harmful to the environment like carbon dioxide or methane so they are more environmentally friendly. Their disadvantages are that they don't produce as much energy/electricity as fossil fuels. Another disadvantage is that they rely on their surrounding. For example, wind energy needs to be generated at a windy location and needs wind turbines that take up a lot of space or solar energy needs to be generated at a sunny area and needs lots of solar panels.

bạn tự viết đó hả?

unpeaceful >< Peaceful
Unpeaceful :không hòa bình

Disagreement >< Peaceful

Disharmony >< Peaceful

Fighting >< Peaceful

War >< Peaceful

Agitation >< Peaceful

Distress >< Peaceful

Frustration >< Peaceful

Upset >< Peaceful

Worry >< Peaceful

TURN INTO REPORTED SPEECH :WH-QUESTION.

1. She said to me "What your name".

\(\Rightarrow\) She asked me what my name was.

2. She asked him "when do you leave this place ".

\(\Rightarrow\) She asked him when he left that place.

3. He asked me "what time did you go to bed last night ?"

\(\Rightarrow\) He asked me what time I had gone to bed the previous night.

4. "How many classes are there in your school ?"my mother asked.

\(\Rightarrow\) My mother asked me how many classes there were in my school.

5. She said "How do you go to the market ?"

\(\Rightarrow\) She asked me how I went to the market.

6. They asked me "what were you doing at 7 o'clock yesterday when I called you ?"

\(\Rightarrow\) They asked me what I was doing at 7 o'clock the previous day when they called me.

7. We asked "what time does the plane arrive ?"

\(\Rightarrow\) We asked me what time the plane arrived.

8. "Why did they leave without saying a work ?" she said to me.

\(\Rightarrow\) She asked me why they had left without saying a word.

9."What will yo do when you grow up, John ?"The teacher asked.

\(\Rightarrow\) The teacher asked John what he would do when he grew up.

Good luck!

1.She asked me what my name was 2.She asked him when he left that place 3.He asked me what time i had gone to bed the previous night 4.My mother asked me how many classes there were in my school 5.She asked me how i went to the market 6.They asked me what i was doing at 7 o'clock the previous day when they called me 7.We asked him what time the plane arrived 8.She asked me why they had left without saying a word 9.The teacher asked John what he would do when he grew up