1. Let's go to the movie.

2. Mr. John will visit his grandparents tonight.

3. We have a thirty-minute break.

4. English is the subject I like best.

Question 22. I was absent ___________ class yesterday.

A. in

B. of

C. from

D. at

Question 23. He was delighted ___________ the present you gave him.

A. in

B. to

C. for

D. with

Question 24. It is very kind ___________ you to help them.

A. of

B. in

C. about

D. to

Question 25. It is difficult ___________ handicapped children to study with other children.

A. to

B. for

C. on

D. from

Question 26. I'm very grateful ___________ her for her help.

A. on

B. of

C. about

D. to

10.Good

11.terribly 

12.terrible 

13.beautiful

14. beautifully 

15. clever 

16.cleverly

17.tidy 

18.tidily 

19. warmly

20. warm

6A 7A 8A 9C 10C

Question 17. Do volunteers often spend time helping other people in ___________, orphanages or homes for the aged.

A. capitals

B. markets

C. schools

D. hospitals

Question 18. we are helping the poor people in the remote areas.

A. faraway

B. nearby

C. small

D. difficult

Question 19. During summer vacations, we teach children in ___________ areas how to read and write.

A. mountain

B. urban

C. mountainous

D. suburb

Question 20. What kind of ___________ work are you participating in?

A. voluntarily

B. volunteer

C. voluntary

D. volunteerism

Question 21. People who are not in good health are ___________ people.

A. elderly

B. homeless

C. rich

D. sick

=> 1,6 - 0,1 . 0,8 .10 = 12a.

=> a = \(12,1m/s^2\)

Áp dụng định luật II Niuton.

\(\overrightarrow{F}+\overrightarrow{F_{ms}}+\overrightarrow{P}+\overrightarrow{N}=m\overrightarrow{a}\)
\(oy:N=P=mg\)
\(ox:F-F_{ms}=ma\)
\(F=\mu N=ma=F-\mu mg=ma\)

1p = 60s

Vật trong 1p vật đó thực hiện được 

30.60 = 1800 Hz

Gia tốc của chuyển động sau 5s là 

\(a=\dfrac{v.t_0}{t}=\dfrac{10-0}{5}=2\left(\dfrac{m}{s^2}\right)\)
Vận tốc của vật sau 10s là

\(v_t=v_0+at=0+2.10=20\left(\dfrac{m}{s^2}\right)\)