1. Richard feels good than several days ago.

A         B             C                 D

2. Mary and Daisy are both intelligent students. Mary is so intelligent as Daisy.  

                A                        B                                                           C                        D

3. I found the conversation as most interesting and I was glad to practice my

A                                                  B                       C                             D

English.

4. The Caspian Sea, a salt lake, is the largest than any other lakes in the

     A                                        B                     C                                         D

world.

5. He drives the car more dangerous than his brother does.

  A                                           B         C                           D

6. It was the most biggest building that I had ever seen.

    A                             B                             C     D

7. I wish my house were so large as Jone’s.

   A    B              C           D

8. The Mekong is one of the longer river in the world.

     A                                B                 C                        D

9. She can play the piano more good than her sister.

   A             B                          C                     D

10. Many people believe that New York is the most great city in America.

A                                                              B                C                  D

11. Jessica is only an amateur, but she sings well than most professionals.

A         B                                             C      D

12. This house is more spacious as that white house I bought in Rapid City,

    A                             B                    C                                                        

South Dakota last year.

   D

13. Lan is the more capable of the three girls who have tried out for the part

A                                 B                           C

in the play.

      D

14. This telephone isn’t as cheap the other one, but it work much better.

A                          B                                  C      D

15. Stories are the most good way of teaching moral lessons to young

    A                                B           C                      D

people.

16. The fastest you drive, the greater you get.

                A                     B   C                       D

17. This exercise is much more easier than the others.

                               A         B                      C            D

18. London is much more exciting as I expected.

                         A                  B        C            D

19. The large the room is, more people can sit in it.

           A                         B         C                         D

20. The suitcase seemed to get heavy and heavier as I carried it along the road.                                      A                                     B                   C                                 D

V. Choose the underlined part among A, B, C, or D that needs correcting.

Tìm lỗi sai và sửa lại

1. Richard feels good=>better than several days ago.

A         B             C                 D

2. Mary and Daisy are both intelligent students. Mary is so=>as intelligent as Daisy.  

                A                        B                                                           C                        D

3. I found the conversation as=>the most interesting and I was glad to practice my

A                                                  B                       C                             D

English.

4. The Caspian Sea, a salt lake, is the largest =>larger than any other lakes in the

     A                                        B                     C                                         D

world.

5. He drives the car more dangerous=>dangerously than his brother does.

  A                                           B         C                           D

6. It was the most =>x biggest building that I had ever seen.

    A                             B                             C     D

7. I wish my house were so=>as large as Jone’s.

   A    B              C           D

8. The Mekong is one of the longer=>longest river in the world.

     A                                B                 C                        D

9. She can play the piano more good =>better than her sister.

   A             B                          C                     D

10. Many people believe that New York is the most great =>greatest city in America.

A                                                              B                C                  D

11. Jessica is only an amateur, but she sings well=>better than most professionals.

A         B                                             C      D

12. This house is more=>as spacious as that white house I bought in Rapid City,

    A                             B                    C                                                        

South Dakota last year.

   D

13. Lan is the more =>most capable of the three girls who have tried out for the part

A                                 B                           C

in the play.

      D

14. This telephone isn’t as cheap=>cheaper than the other one, but it work much better.

A                          B                                  C      D

15. Stories are the most good=>best way of teaching moral lessons to young

    A                                B           C                      D

people.

16. The fastest=>faster you drive, the greater you get.

                A                     B   C                       D

17. This exercise is much more=>x easier than the others.

                               A         B                      C            D

18. London is much more exciting as=>than I expected.

                         A                  B        C            D

19. The large the room is, more=>the more people can sit in it.

           A                         B         C                         D

20. The suitcase seemed to get heavy=>heavier and heavier as I carried it along the road.                                      A                                     B                   C                                 D

a: ΔABC cân tại A

mà AH là đường cao

nên H là trung điểm của BC

Xét tứ giác ABDC có

H là trung điểm chung của AD và BC

nên ABDC là hình bình hành

Hình bình hành ABDC có AB=AC

nên ABDC là hình thoi

b: H là trung điểm của BC

=>\(HB=HC=\dfrac{BC}{2}=3\left(cm\right)\)

ΔAHB vuông tại H

=>\(AH^2+HB^2=AB^2\)

=>\(AH^2=5^2-3^2=16\)

=>AH=4(cm)

AD=2*AH

=>AD=2*4=8(cm)

c: 

Xét tứ giác AHCF có

E là trung điểm chung của AC và HF

nên AHCF là hình bình hành

Hình bình hành AHCF có \(\widehat{AHC}=90^0\)

nên AHCF là hình chữ nhật

=>AH\(\perp\)AF và HC\(\perp\)FC

d: ABDC là hình thoi

=>\(\widehat{BAC}=\widehat{BDC}=60^0\)

ABDC là hình thoi

=>\(\widehat{ABD}+\widehat{BAC}=180^0\)

=>\(\widehat{ABD}=120^0\)

ABDC là hình thoi

=>\(\widehat{ABD}=\widehat{ACD}=120^0\)

Bài nào v ạ

(oh) hóa trị 1 mà zn hóa trị 2=> cthh la zn(oh)2

với lại ko có oh2 dau chi co OH hoac la H2O

phải viết là Zn(OH)₂ vì nhóm (OH) hóa trị I

Nhưng mà Zn có hóa trị là II, nhóm (OH2) có hóa trị là I, nếu như vậy, theo CTHH, ta có:

\(x.II=y.I\Rightarrow\frac{X}{Y}=\frac{I}{II}\Rightarrow X=1;Y=2.\)

Vậy CTHH của hợp chất là: Zn(OH₂)₂ chứ nguyên nhóm (OH₂ ) có hóa trị là I mà chứ đâu phải nhóm (OH). Xem lại giùm mình đi bạn!

I. Choose one sentence that best rewrites the sentence given:

1.      They understand more than we do.

A.    We don’t understand as much as they do.

B.    We  don’t understand anything at all.

C.    They understand everything inside out.

D.    They are very intelligent.

2.      It is much more difficult to speak English than to speak French.

      A. To speak French is more difficult than to speak English.

      B. To speak English is more difficult than to speak French.

      C. Speaking English is more difficult than to speak French.

      D. Speaking French is not as difficult as to speaking English.

3.      My interview lasted longer than yours.

      A. Your interview wasn’t as short as mine.

      B. Your interview was shorter than mine.

      C. Your interview was as long as mine.

      D. Your interview was longer than mine.

4.      When I was younger, I used to go climbing more than I do now.

      A. Now I don’t go climbing anymore.

      B. I used to go climbing when I was younger.

      C. Now I don’t go climbing as much as I did.

      D. I don’t like going climbing any more.

5. Your coffee is not as good as mine.

            A. Mine is better than yours.

            B. My coffee is better than your.

            C. My coffee is better than yours.

            D. My coffee is more good than yours.

6. I can’t cook as well as my mother does.

            A. My mother can cook better than I can.

            B. My mother can’t cook better than I can.

            C. My mother can cook well than I can.

            D. I can cook better than my mother can.

7. Murder is the most serious of all crimes.

            A. Murder is very serious.

            B. No crime is more serious than murder.

            C. Everyone is very afraid of murder.

            D. Murder is the dangerous crime.

8. No one in this class as tall as peter.

            A. Peter is taller than in this class.

            B. Peter is the tallest in this class.

            C. Peter is the most tall in this class.

            D. Peter is more tall than in this class.

9. This is the best music I have ever heard.

            A. I‘ve ever heard better music than this.

            B. I‘ve ever heard such a good music as this.

            C. I‘ve ever heard so good music as this.

            D. This is the first time I‘ve heard this good music.

10. People dive fast. Many accidents happen.

A. The faster people drive, the more accidents happen.

B. The more fast people drive, the more accidents happen.

C. The much fast people drive, the more accidents happen.

D. The faster people drive, the much accidents happen.

8. I meet him much. I hate him much.

A. The better I meet him, the more I hate him.

B. The more time I meet him, the more I hate him.

C. The more I meet him, the more I hate him.

D. The better I meet him, the better I hate him

.II. Give the suitable comparion to complete each sentence. (cho dạng so sánh đúng)

1. The weather today is……hottest…. than it was yesterday. ( hot )

2. The ……largest ….. city in Canada is Toronto. ( large )

3. This story is ………funnier….. than that one. ( funny )

4. I’m taking four classes. My history class is the  ……most interesting…… of all.

( interesting )

5. The Pacific is ………deeper…. than the Mediterranean Sea. ( deep )

6. You can write …………better…… than I can ( well )

7. My father drives  ………more carefully………. than I do. ( carefully )

8. Indonesia is……larger.. than Japan in population. ( large )

9. Mt. Everest is ………the highest…… mountain in the world. ( high )

10. _______ths older___ my grandparents get, ________the happier_____ they are. (old – happy)

11. ______the hotter____ it is, ________the weaker___ Hoa is. (hot – weak)