một con ngựa kéo một xe với lục kéo không đổi là 500N đi quãng dường 5km trong 30 phút . tính công va công suất của con ngựa

một khối gỗ có thể tích 50cm3 được thả vào bình nước sâu bt khối lượng riêng của gõ làn luotj là d1=6000N/m3 d2=10000N/m3

a khối gỗ nổi hay chìm vì sao

b biểu diễn các lục tác dung lên khối gỗ

một tàu ngầm lặn dưới đáy biển sâu 180m biết trọng lượng riêng của nước là10300N/m3 . hãy tính: 

a áp suất tác dụng lên mặt ngoài của thân tàu là bao nhiêu

 b đẻ có áp suất tác dụng lên mặt ngoài của thân tàu là 2163000N/m2 thì tàu lặn ở độ sâu bao nhiêu so với lúc trước

Part 2: Rewrite or combine the sentences, using the suggested words..

Example: 0. I haven’t seen this kind of hat before.

@ Thisis..........................................................................................................................

You write: This is the first time I have ever seen this kind of hat.

1. Vinh really loves to hang out with his friends.

=> Vinh really enjoys........................................................................

2. Playing beach games is very interesting.

=> It is.......................................................................................

3. Most ethnic peoples in Vietnam speak their own languagues (Make question)

=>....................................................................................................

4. The girl worked hard. Her step mother wasn't happy (use Although)

=>............................................................................................... .....

PART II. Use the suggested words and phrases to write completed sentences (1 pt).

1. They/ watch/ a football match/ TV/ 7.00 last night.

…………………………………………………………………………………………...

2. I/ love/ hang/ out/ with/ friend.

…………………………………………………………………………………………...

3. Herd/ buffaloes/ to be/ excite.

…………………………………………………………………………………………...

4. According/ tradition/ we/ should/ greet/ older/ people/ respectfully/ before them.

…………………………………………………………………………………………..

PART IV. Circle A, B, C or D which is the best for the following sentences. (2 pts)  

1. When my father arrived home, we ……………… plants in the garden.

A. watered                 B. were watering                   C. watering                D. was watering

2.  You …………………. tip in Vietnam.

A. don’t have to        B. have to                  C. must                                   D. mustn’t

3. Vietnamese people …………………… their ancestors.

A. commemorate      B. offer incense        C. worship                             D. preserve

4.  ……………. the first footer has very good reputation and success, the families believe that they will receive luck and good fortune throughout the year.

A. Although               B. However               C. Therefore                          D. If

5. We …………….our promise to the children.

A. shouldn’t break   B. should follow       C. don’t have to follow     D. Both A & B are accepted  

6.  Lucky money is put in red envelopes, ……….the red envelopes symbolize luck and wealth.

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

7. This time last week, I ……………….  shopping with my mother.

A. was going              B. went                       C. go                                       D. have gone

8.  I think An Tiem was very…………………to carve the island’s name and his own name on the water melons and threw them into the sea.

A. cunning                 B. mean                      C. wise                                   D. Generous

9. While I ............the performance, I met one of my old friends.

A. watched             B. was watching                 C. watch               D. am watching

10. You should buy the blue sweater. It suits you ...........than the red one.

A. good                  B. well                              C. better                 D. the best

11. The ............ of quan ho singing has been recognized as a world heritage.

A. preservation       B. procession                    C. song                  D. performance

12. Saint Giong was unable to talk, smile, or walk ......... he was three years old.

A. even though       B. because                       C. while                  D. if

13. It's a rule, so everyone ...............strictly follow it.

A. doesn't have to   B. shouldn't                      C. has to                 D. should

14. The 54 ethnic peoples of Vietnam are............, but they live peacefully.

A. similar               B. unlike                           C. diverse