Thời gian của một người đi bộ đi trên quãng đường đầu 

\(t_1=\dfrac{s_1}{v_1}=\dfrac{3}{7,2}=\dfrac{5}{12}\left(h\right)\)

Vận tốc trung bình của một người đi bộ đi trên cả hai quãng đường

\(v_{tb}=\dfrac{s_1+s_2}{t_1 +t_2}=\dfrac{3+1,95}{\dfrac{5}{12}+0,5}=5,4\left(\dfrac{km}{h}\right)\)

III/ Choose the best word in each bracket to complete the sentences.
1-  I don’t think Fred gets (over/ on/ through) with Alice. They always argue.
2- You should take your hat (in / over/ off ) in the cinema.
3-  I love travelling to this place ( when / though / so that / as ) it’s the quietest place in the city.
4-  They plan to bring (up / out/ at/ with ) a guidebook to different beauty spots in Da Nang city.
5-  Every body should look ( out / after/ up/ through ) this leaflet before coming to this attraction.
6-  He said he ran ( into / to/ out / on ) of his savings because of  these books.
7- We keep changing the design of our traditional products ( so that/ because/ although/ when ) we can sell more goods.
8-  We have to study hard so that we can keep (on/ up/ in/ to ) with the development of technology.
9-  He turned ( on/ off/ up/ down ) 15 minutes late due to missing the bus.
10- The villagers here are dealing ( with/ to/ about/ in ) the competition between the craft villages
11-  Artisans must face up ( with/ about/ in / to ) the reality that the sales of their handicrafts are going down and down.
12-  He thinks he can’t take ( over/ on / up/ in ) the business since he’s too young.

Câu 1 chỉ một tuần có ...ngày 

five nha bạn.

1. Five

2. Favorite 

3. Interesting 

4. Because 

5. Of

English .

Singing.

Beautifully.

1.C

2.C

3.B

Woke up

Has taken

Crossing

Did - leave

D

A

A

B

D

D

B

C

D

D

A

B

B

B

D

Làm gì có 2 but và because đâu bạn và làm gì có have