Giải :
Chiều rộng hình chữ nhật là :
72 : 9 = 8 (cm )
Chu vi hình chữ nhật là :
(9 + 8) x 2 = 34 ( cm ) 
                Đáp số : 34 cm.

Leonardo Da Vinci

C

VI-Put these verbs into present perfect tense.

      1.   I (do) ................................... all the housework. The flat is really clean now.

      2.   He (write) ................................... a novel for two years.

      3.   I (never meet) ................................... this girl before.

      4.   My brother (leave) ................................... home for 10 years.

      5.   I (not see) ................................... my close friend since 2013.

      6.   My mother (buy) ................................... this bike since last week.

      7.   Peter (never see) ................................... a zebra before.

      8.   Nga (be) ................................... to England for 3 days.

      9.   They (travel) ................................... around the world once.

      10. The teacher (tell) ................................... this story three times.

IV-Put a correct preposition into the blank.

      1.   Can I help you            ....................... your bag, Lan ?

      2.   We are very interested ....................... the history of Vietnam.

      3.   My house is next ....................... the stadium.

      4.   Might you sit ....................... the front seat, Nam?

      5.   His alarm clock didn’t go.......................                   

      6.   My dream house will be ....................... the ocean.

      7.   I will buy some modern machines ....................... my sweet home.

      8.   There is a wonderful garden ....................... front ....................... my house.

      9.   Tom dislike walking ....................... the rain.

      10. Will you come ....................... Da Lat ....................... us?

I-Choose the best answer A, B, C or D.
11. A robot can cook, .................... tea or coffee, and clean the house.

            A. do                           B. build                       C. make                       D. bake

      12. They will be able to build houses, .................... and roads.   

            A. sand                        B. bricks                      C. meals                      D. bridges

      13. Robot is a .................... invention of human beings. 

            A. old                          B. young                     C. modern                   D. ancient

      14. The robot has .................... all the housework in his house.  

            A. do                           B. doing                      C. did                          D. to do

      15. This morning, the robot .................... a big breakfast for our family.

            A. made                      B. makes                     C. make                       D. making

      16. He .................... swim when he .................... 5 years old.     

            A. can/ was                 B. could/ is                  C. could/ was              D. can/ was

      17. He will be able .................... the conversation after he learns this English course,

            A. understand             B. to understand         C. understanding        D. understood

      18. Would you like the robot .................... it for you?

            A. to do                       B. do                           C. doing                      D. did

      19. I think by 2030 robots .................... talk to people

            A. are able                   B. will be able to         C. can                          D. could

      20. She .................... the piano since 2000.

            A. could play              B. can play                  C. has played              D. will play

I-Choose the best answer A, B, C or D.

      1.   He likes playing basketball ..................... it is so funny.

            A. so                            B. because                   C. but                          D. although

      2.   ..................... will be the winner in this sport competition?

            A. Who                       B. What                       C. Why                        D. When

      3.   He ..................... out with his friends last week.

            A. go                           B. goes                        C. went                       D. going

      4.   He ..................... as a new reporter since he ..................... from Boston university.

            A. worked / graduated                                    C. works/ graduates

            B. has worked/ graduated                               D. worked/ has graduated

      5.   Do Son is ..................... beach in Hai Phong.

            A. the more beautiful                                      C. the most beautiful

            B. more beautiful                                            D. most beautiful

      6.   This is the first time we ..................... Eiffel Tower in Paris.

            A. visit                        B. has visited              C. have visited            D. visited

      7.   My father likes watching TV ..................... he spends most of his time in the evening watching his favourite programmes.

            A. so                            B. because                   C. and                         D. but

      8.   Please ..................... up, we are going to be late for school again.

            A. to hurry                  B. hurries                     C. hurry                       D. hurrying

      9.   A long film which is broadcast in short parts is a .....................        

            A. audience                 B. a film producer       C. TV series                D. cartoon

      10. A person who hosts an event is a ..................... 

            A. actor                       B. MC                         C. comedian                D. reporter

Lúc 7 giờ 30 phút bác Trung đi xe máy từ thành phố về thăm quê, trên đường đi bác bị hỏng xe nghỉ chữa xe mất 30 phút và bác ở lại quê 3 giờ 30 phút rồi về thành phố lúc 15 giờ 30 phút. Quãng đường từ quê đến thành phố dài 80 km. Hỏi bác Trung đi với vận tốc trung bình là bao nhiêu km/giờ