Part 1

1 friendliness

2 were

3 after

4 written

5 correspond

6 which

Part2

1 - D

2 - C

3 - A

4 - G

5 - E

6 - F

Part 3

1 should do

2 visiting

3 cut

4 made

5 has learnt

6 modernize

7commercial

8 untreated

Part 4

1 will => would

2 carefully => careful

Part 5

1 I would pay a visit to 

2 planted trees along the

3 going to be sent

4 which I borrowed from

Part 6

1 subtances

2 Industrial

3 frequently

4 that

Part 1

1 friendliness

2 were 

3 after

4 written

5 correspond

6 which

Part 2

1D 2C 3A 4G 5E 6F

Part3

1 have to do

2 visiting

3 cut

4 was making

5 has learnt

6 modernize

7 commercially

8 mistreated

Part 4

1 will -> would

2 carefully -> careful

Part 5

1 to pay a visit

2 planted trees along the

3 going to be sent 

4 that I borrowed from

Part 6

1 substances

2 industrial

3 naturally

4 that 

Part 7

1F 2F 3T 4T

\(\Leftrightarrow\sqrt{x+4}\left(\sqrt{x-4}-2\right)=0\)

\(\Leftrightarrow\left[{}\begin{matrix}x+4=0\\x-4=4\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=-4\\x=8\end{matrix}\right.\)

1.needn't

2.impressed

3.the

4.send

5.the

6.who

ko biết đúng ko nữa 

Part 1

1 needn't

2 impressed

3 with

4 send

5 the

6 who

Part 2

1f 2d 3c 4b 5a 6g

Part 3

1 was cooking

2 surfing

3 went

4 was going to visit

5 try

6 widened

7 cultural

8 conveniently

Part 4

1 serious -> seriously

2 well-preserved -> be well-preserved

Part 5

1 my english were good

2 going to the english-

3 area has been spoiled 

4 which I read 

Part 6 

1 without

2 be damaged

3 healthy

4 destruction

Part 7

2F 3F 4F

x*(y-2)=3

mà 3=1*3=-1*-3

ta có bảng sau lập bảng gải từng th

Part 1

1 into

2 which

3 happily

4 aspect

5 if

6 compulsory

Part 2

1c 2f 3b 4g 5a 6e

Part 3

1 opened

2 to be finished

3 repairing

4 driving

5 harmful

6 modernize

7 environmentalists

8 effectively

Part 4

1 disappointing -> disappointed

2 come -> came

Part 5

1 succeed although he tried 

2 my father could speak

3 seen such an interesting 

4 being made to protect

Part 6

1 forest

2 climate

3 in

4 fortunatelt

Part 7

1T 2F 3F 4F