VII. tìm và chữa  lỗi sai

1. She rarely goes to the cinema  at weekend, isn’t she?

     A                B                                C                  D

2. She will pay  less  but she uses to energy- saving bulbs.

                      A     B      C                             D

3. She walked ten kilometers a day to get water enough for her family to use.

                                                     A                         B         C                       D

4. I have already cleaned the floor, but I still need dusting the furniture.

                         A                                                        B        C               D

5. I knew Tim when he was a child, but I didn’t see him for many years.

            A                             B                   C                            D

6. A tourist wanted to know  whether she  take  any  photos there

                                   A            B                C                          D

7.They  worked  in the garden  when  it  started  to  rain.            

                  A      B                      C              D

8. Thanks  for   invite  me  to    your    birthday party.                

         A                     B            D                     D

9. You have never been to Ho Chi Minh City before, haven’t you?

              A               B                                       C            D

10. He is not old enough driving motorbike.

              A         B                   C             D

1. Please don't make so much noise... I’m... trying... (I / try) to work.

2. Let's go out now .....It isn’t  raning.. (it / rain) any more.

3. You can turn off t he radio........I'm not listening...............(I / listen) to it.

4. Kate phoned me last night. She's on holiday in France. ...She is having.............(she / have) a great t ime and doesn't want to come back.

5. I want to lose weight, so t his week ....I'm not eating......... . . ....... .......... .. ..... (I / eat) lunch.

6. Andrew has just started evening classes. .. .............He is learning..... ........ . .. (he / learn) Japanese

7. Paul and Sally have had an argument. .. .................... ..They are speaking... .... . ........ (they / speak) to each other.

8. ..........I am getting.. .... (I /get) tired. I need a rest.

9. Tim ....... . .. .........isn't working......... (work) today. He's taken the day off.

10. .... .I am looking . (I / look) for Sophie. Do you know where she is?

1+1=2

1.Selina lives.....in............a village in Africa.Her day starts......at..........4o'clock.She gets up and she walks three kilometers...to.........the river.She collects some water,and she carries it back....to..........her house.The water is very heavy.It isn't clean but there isn't any water in the village.Selina doesn't go....to.........school because there is not school for the children.

2Mrs Chi and her children......are.............working in the garden .She has a very beautiful garden behind her house .There are....a...........lot of flowers in the garden .She usually puts......some.......flowers in the sitting room.Mrs Chi has.......a.........friend...............in......LonDon.Her friends are .......going..............to visit her familly next week .Mrs Chi often gives them a .........lot of..............flowers when they go home from her house.

*n_A= \(\dfrac{m_A}{M_A}\)  =>  0.2=\(\dfrac{4.8}{M_A}\)

              <=> M_A= 24

Vậy kim loại A là Magie(Mg)

*n_{Fe =  \(\dfrac{m_Fe}{M_Fe}\)}  =>  n_{Fe =\(\dfrac{11,2}{56}\)}

                        _<=>n_Fe= 0,2

n_B = \(\dfrac{m_B}{M_B}\)  => 0,32-0,2= \(\dfrac{3,24}{M_B}\)

                   <=> M_B=27

Vậy kim loại B là nhôm (Al)

I'm the younger person in my familly 

-younger ->  youngest

My brother is busyyer tham i am

busyyer tham -> busier than

Mary is taller that her sister

that-> than

Zhang is from China.She speak Chinan

speak Chinan -> speaks Chinese

LonDon is smallest than Mexico city

smallest-> smaller

She's  my friend.She's from French

French-> France

Is your kitchen bigger than my kitchen?

my kitchen-> mine

How height is the Petronas Twin Towers?

height -> tall

Which season is coldest in your country?

coldest-> the coldest

My brother is so generous that he willingly lends people money.

6.D   7.B

I.1.C 2B 3B  4D  5D 6B 7B 8C 9C 10D 11D 12C

a/ A=(4-5x)² - (3+5x)²

        = (4-5x-3-5x).(4-5x+3+5x)

      = -10x . 7

      = -70x

Vậy A=-70X

b/ B= (3x-1)(1+3x)-(3x+1)²

      = 9x²-1- 9x²+6x+1

      = 6x

Vậy B=6x

c/ C=(2x+5)³-(2x-5)³-(120x²+49)

      = (2x+5-2x+5)[(2x+5)²+(2x+5)(2x-5)+(2x-5)² ]-(120x²+49)

      =  10.(4x²+20x+25+4x²+10x-10x-25+4x²-10x+25)-(120x²+49)

      = 10.(12x²+10x+25)-(120x²+49)

      =120x²+100x+250-120x²-49

      = 100x+201

d/ D=(2a-b+2)³-6(2a-b+2)²+12(2a-b+2) -8- (2a-b)³

      = (2a-b+2)[(2a-b+2)²-6(2a-b+2)+12]-( 2+2a-b).[4-2(2a-b)+(2a-b)² ]

      = (2a-b+2)(4a²-4ab+b²+8a-4b+4-12a+6b-12+12)-(2a-b+2)(4-4a+2b+4a²-4ab+b2)

      = (2a-b+2)(4a²-4ab+b²-4a+2b+4-4+4a-2b-4a²+4ab-b²)

       = (2a-b+2).0

       =0