Ex9:

1. Will fossil fuel energy be replaced by another name of non-renewable energy or not?
2. We will surprise at the new means of transports in the future.

3. It is undoubted that recycling is a very effective way to save energy

4. Chưa nghĩ ra

5. It is alarming that many people in undeveloped countries die everyday because of starvation

Ex10:

1.Chưa nghĩ ra

4.How is over-population caused?

5Chưa nghĩ ra

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1. Will fossil fuel energy be replaced by another name of non-renewable energy or not?

2. We will surprise at the new means of transports in the future.

3. It is undoubted that recycling is a very effective way to save energy

4. An amount of energy consumption has kept increasing over last few decades because of sharp increase of world population

5. It is alarming that many people in undeveloped countries die everyday because of starvation

X.

1.Without doubt, people must stop ever over-exploiting,over-using and wasting energy sources right now 

4.How is over-population caused?

5.It is surprising that some European countries have to import trash from other countries to recycle