II

1 driver

2 participants

3 useless

4 electrician

5 building

6 variety

7 creative

8 poisonous

III

1 B => happy

2 C => between

3 B => seriously

4 A => excited

5C => to spending

6 B => ought to be

7 C => for

8 her => herself

IV

1 to buy

2 has been

3 will be going

4 to work

5 saw

6 to lock

7 don't know

8 are wasting

D Reading

1 T

2 F

3 T

4 F

II

1 to

2 Most

3 However

4 use

III

1 In Milton Keynes, a town about 70 kilometres northwest of London.

2 They can select their terminal, read the news, check e-mails or play video games.
3 No, they aren't

4 Yes, they are

E WRITING

1 Flying car will be showed to the public when they finish it

2 Unless we try to save sources of energy, they will soon end

3 Long's collection has over eight hundred stamps

4 The stomachache prevented Mr Thanh from enjoying the meal

5 Is this the best hotel you could find?

6 This is the first time I have seen that man

7 The coffee is too hot for me to drink

8 It took Peter three hours to repaint his house

II

1 This time tomorrow they will be studying in the library

2 I think biogas is abundant and cheap for cooking and heating

3 Is wind a renewable source of energy?

4 We should reduce the use of electricity to save our energy

Bài 3: 

a: Theo đề, ta có hệ phương trình:

\(\left\{{}\begin{matrix}4a+b=3\\2a+b=-1\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}2a=4\\2a+b=-1\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}a=2\\b=-1-2a=-5\end{matrix}\right.\)

has collected-was

to spend

will try

underline-to learn

to move

working

to water

fly-is

is

playing

spending-going

watching

making-drawing

eating

turning

1.C 2.B 
Chúc bạn học tốt

II.

1.C

2.B

3.B

4.D

5.D

6.C

7.D

8.A

9.A

10.D

11.A

12.C

13.C

14.C

15.D

\(\dfrac{9}{23}+\dfrac{53}{3}+\dfrac{2}{69}+\left(-15\right)\)

\(=\dfrac{9.3}{23.3}+\dfrac{53.23}{3.23}+\dfrac{2}{69}+\dfrac{-15.69}{1.69}\)

\(=\dfrac{27}{69}+\dfrac{1219}{69}+\dfrac{2}{69}+\dfrac{-345}{69}\)

\(=\dfrac{903}{69}\)

\(=\dfrac{301}{23}\).

with

on

= 28/15 . 3/4 - ( 11/20 + 1/4 ) : 7/3

= 28/15 . 3/4 - 4/5 : 7/3

= 7/5 - 12/35

= 37/35

= \(\dfrac{28}{15}\) . \(\dfrac{3}{4}\) - (\(\dfrac{11}{20}\) + \(\dfrac{1}{4}\)) : \(\dfrac{7}{3}\)

= \(\dfrac{7}{5}\) - (\(\dfrac{11}{20}\) + \(\dfrac{5}{20}\)) : \(\dfrac{7}{3}\)

=  \(\dfrac{7}{5}\) - \(\dfrac{16}{20}\) : \(\dfrac{7}{3}\)

=  \(\dfrac{7}{5}\) - \(\dfrac{16}{20}\) x \(\dfrac{3}{7}\)

=  \(\dfrac{7}{5}\) - \(\dfrac{12}{35}\)

=  \(\dfrac{49}{35}\) - \(\dfrac{12}{35}\)

= \(\dfrac{37}{35}\)

-13/25x9/17+13/17x8/25+(-13/25)

=-13/25x9/17+8/17x13/25+(-13/25)

=13x(-9/17+8/17-1)

=13x(-18/17)=-234

a) Ta có: \(\dfrac{-13}{25}\cdot\dfrac{9}{17}+\dfrac{13}{17}\cdot\dfrac{8}{25}+\dfrac{-13}{25}\)

\(=\dfrac{-13}{25}\cdot\dfrac{9}{17}-\dfrac{-13}{25}\cdot\dfrac{8}{17}+\dfrac{-13}{25}\)

\(=\dfrac{-13}{25}\left(\dfrac{9}{17}-\dfrac{8}{17}+1\right)\)

\(=\dfrac{-13}{25}\cdot\dfrac{18}{17}\)

\(=-\dfrac{234}{425}\)