A

C

B

C

A

C

B

C

D

B

1A

2C

3B

4C

5B

6C

7B

8C

9D

10B

1.are learning 

2.teaches

3.went

4.fly

5.Did they buy

1. are learing

2. teaches

3. went

4. fly

5. Did - buy

1. are learning 

2. teaches

3. went

4. fly

5. Did / buy

1. worried

2. boring

3. driver

4. information

5. comfortable

worried

boring

driver

information

comfortable

1. Worried

2. Boring

3. Driver

4. Information

5. Comfortable

\(x^2=x^3\\ \Rightarrow x^2-x^3=0\\ \Rightarrow x^2\left(1-x\right)\\ \Rightarrow\left[{}\begin{matrix}x^2=0\\1-x=0\end{matrix}\right.\\ \Rightarrow\left[{}\begin{matrix}x=0\\x=1\end{matrix}\right.\)

x = 0 hoặc x = 1 vì mũ của 0 và 1 kq vẫn là chính nó

\(x^2=x^3\Rightarrow x^3-x^2=0\Rightarrow x^2\left(x-1\right)=0\Rightarrow\left[{}\begin{matrix}x^2=0\\x-1=0\end{matrix}\right.\)

\(\Rightarrow\left[{}\begin{matrix}x=0\\x=1\end{matrix}\right.\) \(\Rightarrow x\in\left\{0;1\right\}\)

be beautiful sights in the village when I lived here. 
be many old buildings 10 years ago. 
was built here. 
owned this wardrobe since my wedding day. 
been seen for 2 years.

friendly

happy

meeting

impress

widely

3. consumption

4. unpolluted

5. environmentalist

6. disapointing

8. polluted

9. deforest

10. prohibit