1 1/4 đổi ra phân số là 5/4 chứ bạn viết nhầm là 5/1 rồi

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Bài 6: Hãy viết giả thiết, kết luận và chứng minh các định lí sau:
a)Nếu một đường thẳng cắt hai đường thẳng song song thì hai góc so le trong bằng nhau.
b)Nếu hai góc nhọn có cạnh tương ứng song song thì chúng bằng nhau.
 

Bài 8: Cho tam giác ABC có góc A = 90độc . Kẻ AH vuông góc BC (H thuộc BC), kẻ HE vuông góc AC (E thuộc AC)

a) CMR: AB//HE

B) Biết B=60, Tính ACB

XI. Rewrite the sentences, beginning as shown, so that the meaning stays the same.
1. You forgot to turn off the TV last night, didn’t you?
You didn’t remember
2. I think you should go to work by bike.
Why don’t
3. Mr Long lived in the countryside when he was a child.
Mr Long used 
4. We will plant more trees along this street.
More trees 
5. Is pollution the most serious problem?
Pollution is

giúp mik với ạ 

mik cần gấp
 

V. Choose the best answer (A, B, C or D).
1. By the middle of the 21st century, people in developing countries
__________ more renewable energy.
A. uses B. will be using C. used D. have used
2. The wind, the sun, and the wave are some types of ____________ sources
of energy.
A. changeable B. alternative C. cheap D. costly
3. Alternative sources of energy ____________ developed in the near future.
A. is B. was C. has been D. will be
4. Fossil fuels are very common in our society but they ____________ the
environment.
A. renew B. provide C. waste D. pollute
5. “Why is it called a _____________ source?” – “Because it can be replaced
easily and quickly.”
A. effective B. specific C. renewable D. non-renewable

6. Hydro power is _____________ because dams cannot be built in certain
areas.
A. limited B. unlimited C. abundant D. enough
7. At this time next week, we ______________ a wind turbine in our garden.
A. install B. installed C. will installed D. will be installed
8. Biogas is ____________ and cheap for cooking and heating.
A. plenty B. abundant C. serious D. expensive
9. A hydropower station ______________ in the North of the country next
year.
A. was built B. were built C. will be built D. has been built
10. We should put ___________ on our roof for the heating and hot water.
A. solar energy B. equipment C. cracks D. solar panels
11. Remember to ____________ the lights before going to bed.
A. turn B. turn off C. turn on D. stop
12. It is a good idea to use ____________ when travelling long distances.
A. cars B. taxis C. private cars D. public transport
13. What should we do to ____________ electricity?
A. cut B. take C. save D. waste
14. We shout use _____________ light bulbs in our homes.
A. low energy B. little energy C. a bit energy D. efficient
15. In my opinion, nuclear power is not only expensive but also _________ to
our environment.
A. danger B. dangerous C. risk D. disaster
16. Someone’s carbon __________ is a measurement of the amount of carbon
dioxide that their activities produce.
A. effect B. amount C. footprint D. energy
17. Several governments try to ____________ the use of fossil fuels.
A. reduce B. increase C. waste D. save
18. We are looking for cheap, clean and ____________ sources of energy.
A. effective B. efficient C. serious D. dangerous
19. __________ source of energy is the source that can’t be replaced after use.
A. Renewable B. Natural C. Effective D. Non-renewable
20. Wave energy is a source of ____________energy.
A. environment friendly C. environmentally friendly
B. environmental friendly D. environmentally friendliness

IV. Choose the best answer (A, B, C or D).
1. Cyclist and motorist have to wear a ___________ when they ride a
motorbike.
A. cap B. mask C. helmet D. hard that
2. He forgot to give a ___________ before he turned left and got a ticket.
A. hand B. signal C. sign D. light
3. All of us have to obey ____________ strictly.
A. traffic B. traffic rules C. traffic jam D. regular
4. We should wait for the traffic lights _____________ before we cross the
street.
A. turn yellow C. turn green
B. to turn yellow D. to turn green
5. Drivers have to ___________ your seatbelt whenever they drive.
A. tie B. fasten C. put on D. put
6. We should __________ the street at the zebra crossing.
A. walk B. walk through C. walk on D. walk across
7. ___________ is it from your house to the nearest bus stop?” – “about 50
metres”.
A. How much B. How long C. How far D. How often
8. Linh used to __________ jigsaw puzzles in his spare time.
A. do B. does C. doing D. did
9. Public __________ in this city is quite good, and it’s not expensive.
A. vehicle B. travel C. transport D. journey
10. I ____________ marbles when i was young, but now i didn’t.
A. play C. used to play
B. have played D. didn’t use to play
11. There ___________ a bus station in the city centre, but it has been moved
to the suburbs.
A. were B. used to have C. use to have D. used to be
12. ___________ does it take to go from ha noi to ho chi minh city by plane.
A. How much B. How many C. How long D. How far
13. Minh used to ___________ his homework late in the evening.
A. do B. does C. doing D. did
14. If people ___________ the rules, there are no more accidents.
A. follow B. take care of C. obey D. remember
15. You should ___________ right and left when you go across the road.
A. see B. look C. be D. take
16. Hurry up or we can’t ___________ the last bus home.
A. keep B. follow C. go D. catch
17. Lan used to go to school ___________.
A. with bike B. by foot C. in car D. by bus
18. Public ___________ in my town is good and cheap.
A. travel B. journey C. tour D. transport
19. When there is a traffic jam, it ___________ me a very long time to go home.
A. takes B. costs C. spends D. lasts
20. Yesterday rick and peter ___________ round west lake. It took them an
hour.
A. cycle B. cycles C. cycling D. cycled

I. Find the word which has a different sound in the part underlined.

X. Rewrite the sentences so that their meaning stay the same.
1. People choose Khue Van Pavilion as the symbol of Ha Noi..
Khue Van Pavilion...........................................................................................
2. People have restored many old houses in Hoi An.
Many old houses ............................................................................................
3. They have sold out the tickets for the football match between Viet Nam and
Thailand.
The tickets ......................................................................................................
4. King Le Thanh Tong ordered to erect the first Doctors’ stone tablets.
The erection of ...............................................................................................
5. People will plant more trees and plants in the park.
More ..............................................................................................................