Là giây,kí hiệu s

Bài 12. Chia động từ trong hộp vào chỗ trống sao cho thích hợp, sử dụng thể bị động thì tương lai đơn.

1. The government has passed laws to protect the forests, so forests (not)…won't be exploited……for woods any more.

2. If we don’t save natural resouces, they…will be used up…….in the near future.

3. I think that renewable sources of energy ……will be used……………..widely in the future.

4. Scientists believe that new sources of energy ….will be found……..soon.

5. Some windmill…will be built .. .in my hometown. We will probably use wind power instead of hydroelectric power.

6. It is possible that hydroelectricity…will be replaced…by solar or wind energy in the xext decade.

7. A conference on alternative energy…will be held…….next month.

8. A TV program about new sources of energy ….will be broadcasted…..live tomorrow morning.

9. Two thousand of solar panels…will be installed….in this erea next year.

10. Watershed forests…will be put….under protection of the government

Task 23: Choose the responses to complete the conversations. Write A, B, C or D on the answer sheet.
1. Jenny: Could you keep the noise down, please?
Anna: _____________________________
A. So sorry.  B. Go ahead.  C. Yes, you could.  D. Never mind.
2. Charlie: I wonder if you could tell me more about it.
Receptionist: _____________________________
A. Nothing at all.              B. Of course, what would you like to know?
C. Why do you say so?   D. That would be fine.
Task 24: Choose the questions to complete the conversations. Write A, B, C or D on the answer sheet
1. Vera: ______________________________
Jack: Of course not, go ahead.
A. What channel is it on?                          B. What’s on tonight?
C. Do you mind if we change channels?   D. Could I change channels?
2. Maria: I always feel so stressed. _____________________________
Anna: I suggest you spend more time outdoors.
A. What have I done?           B. What’s your matter?

Choose the answer – A, B, C or D – to best complete each sentence.
1. I like ………………books better than ………………films.
A. Ø / Ø B. the / the    C. Ø / the D. the / Ø
2. The Internet is ………………useful invention of modern life.
A. a B. an C. the D. Ø
3. ………………train times are different on ………………Sundays.
A. A / the B. The / the C. Ø / Ø D. The / Ø
4. What do you think of ………………public transport in ………………Ha Noi?
A. Ø / Ø B. a / a C. a / Ø D. the / Ø
5. My uncle and aunt live in ………………small town in ………………United States.
A. a / a B. a / the C. the / the    D. a / Ø
6. Our plane arrives in Ha Noi at ………………two o’clock in ………………afternoon.
A. Ø / the B. the / the    C. a / a D. the / an   
7. At first she was trained to be ………………scriptwriter, but later she worked as ………………secretary.
A. the / a B. a / a C. the / the D. a / the
8. He spent part of ………………afternoon telling them ………………news he couldn’t tell them by………………phone.
A. the / the / Ø B. an / Ø / the C. an / the / the D. the / Ø / the
9. ………………Japanese manage to ask direct questions in order not to embarrass ………………person who they are speaking with.
A. The / the    B. A / a C. The / a D. A / the
10. In most ………………developed countries, up to 50% of ………………population enters higher education at some time in their lives.
A. Ø / Ø B. the / Ø C. Ø / the D. the / a

36. A. wanted B. parked C. stopped D. Watched

37. A. laughed B. passed C. suggested D. Placed

38. A. believed B. prepared C. involved D. liked

39. A. lifted B. Lasted C. happened D. decided

40. A. collected B. changed C. formed D. viewed

Vận tốc của ô tô là :

\(50km/h=\dfrac{50}{5}m/s=10m/s\)

Vận tốc của xe máy \(9m/s\)

Vận tốc của tàu hỏa : \(18m/s\)

Ta sắp xếp tốc độ theo thứ tự giảm dần : Tàu hỏa - ô tô - xe máy. 

\(\Leftrightarrow18m/s>10m/s>9m/s.\)

\(20cm^2=0,002m^2\)

\(18kg=180N\)

Áp suất mà người ấy tác dụng lên mặt sàn là :

\(P=\dfrac{F}{S}=\dfrac{80}{0,002}=40000N/m^2\)

Công suất của bóng đèn là :

\(P=U.I=6.0,2=1,2W\)