Số tuổi của chị : 14 tuổi

Số tuổi của em : 10 tuổi

Bài 4:C

Bài 5: 12%

I started my hobby 2 years ago.

2,had been put up

3,had been painted

4,had been installed 

5,had been delivered 

6,had been bought 

Ukm 

Lúc đầu định gạch Nhg thấy Ns sao sao Ýe nên thôi

 1. A. study B. lunch C. subject D. computer

2. A. school B. teaching C. chess D. chalk

3. A. beds B. lamps C. chairs D. pens

4. A. smart B. sharpener C. grammar D. star

5. A. desks B. chopsticks C. toilets D. bowls

6. A. compass B. homework

Thiếu đề C6 ne

l. A. subject                           B. study                     C.computer               D. lunch

2. A. calculator                     B. fast                        C. father                    D. classmate

3. A. chairs                            B. sofas                      C. rooms                    D.sinks

4. A. lamps                            B. halls                       C. desks                     D. lights

5. A. apartments                    B. cupboards             C. kitchens                 D. bathrooms

6. A. reason                           B. opposite                C. season                   D. sensitive

7. A. island                            B. silent                     C. decide                    D. poster

8. A. great                              B. team                      C. tea                          D. season

9. A. celebration                   B. condition              C. question                D. competition

10. A. price                            B. century                  C. celebrate               D.calculator

a, Vno =2,24l     Vn2 = 3,36l

b, %Vno=40%.    %Vn2=60%

c, %mno= 41,67%.     %mn2 = 58,33%

B

x =1/2