Sách giáo khoa 4 nha các bn !!!

Đặt  I = lim x → 0 x log a 1 - 2 x + 1 - cos x x 2 , 0 < a ≠ 1  cho trước. Kết quả nào sau đây đúng?

A.  I = 1 2 - 2 ln a

B.  I = ln a - 1 2

C.  I = 1 2 + 2 ln a

D.  I = ln a + 1 2

Một hình thoi có độ dài các đường chéo là 6dm và 4dm. Diện tích hình thoi  là

A.  120   d m 2

B.  240   d m 2

C.  12   d m 2

D.  24   d m 2

Question: Complete the second sentence with the same meaning

1. Vinh keeps forgetting his homework.

-> Vinh is ................always forgetting his homework..................

2.It's a pity your friend isn't at this party.

-> I wish .........................your friend were at this party................................

3. We started living here fifteen years ago.

-> We have ........................lived here for fifteen years.......................................

4. Trung's parents gave him a microcomputer on his birthday

-> Trung ................................was given a microcomputer on his birthday by Trung's parents......................................

5. He has never played a computer game before.

-> This is ................. the first time he has played a computer game............................

6. Nga is pleased to meet her aunt again soon.

-> Nga is looking ..................forward to meeting her aunt again.........................................

7. He is too old to have more children.

-> He is so .................ole that more children could be had......................

8. "I'm very busy.I'll ring you tomorrow", Susan said to me

-> Susan ..........................told me that she was very busy and she would ring me the following day..........................

9.Their teacher is making them to study hard.

-> They are ................being made to study hard by their teacher...........................

10. This cheque has not been signed.

-> No ................one has signed this cheque........................

I/ CHOOSE THE BEST ANSWER
1. i haven't eaten anything since i ...... home from football practice
a. have got b. had gotten c. got d. will get
2. dr. lam ............ about the life time of sharks for many year and ....... some awards so far
a. have studied/ had gotten b. had studied/ had gotten
c. has studied/ has gotten d. studied/ will get
3. a large hydroelectric ...... was built on the river Danube
a. power b. dam c. bank d. wall
4. water can be held on the land by vegetation
a. plants used as food b. grown trees c. the growth of plants d. plants and trees
5. .......... air makes people unpleasant to breathe
a. pollute b. pollution c. polluted d. polluting
6. we are now facing the possible ........ of several rare spceies
a. danger b. variety c. existence d. dissappearance
7. of the six people in the plan when it crashed only one......
a. existed b. lived c. hurt d. survived
8. the cattle drank from a river polluted with toxic chemicals
a. waste b. colorless c. odorless d. poisonous
9. the charity is totally dependent .... money from the public
a. from b. in c. upon d. with
10. when the wastes are poured into the atmosphere the air becomes contaminated and unpleasant to breathe
a. dense b. dirty c. upon d. with
11. they were sent to a local ........ right after theirr parent's death
a. orphanage b. hospital c. park d. prison
12. cuc phuong national park is ......... 160km south west of hanoi
a. lied b. established c. abandoned d. located
13. nearly 1000 of the world's bird species are ........ with extinction
a. threatened b. endangered c. protected d. abandoned
14. many people come to the nation parks to see the work being done to protect endangered species
a. plants or animals that may be dangerous to people
b. plants or animals that disappeared form the world
c. plants or animals that are about to die
d. plants or animals that may soon become extinct
15. rare species of plants or ........ can be found in this region
a. fauna b. flora c. flowers d. vegetation
16. the hydroelectric plant provides electricity for half the island's population
a. using hydrogen to produce electricity
b. using radiating energy to produce electricity
c. using water power to produce electricity
d. using tidal power to produce electricity
17. the whale is a(n) .............species, there must be laws to protect them or they will be extinct
a. endanger b. dangerous c. endangered d. endangering
18. if someone........you, say' thank you" to him
a. helps b. helped c. will help d. would help
19. ............. you, i would think twice about that deccision. it could be a bad move
a. if i am b. should i be. c. were i d. if i had been
20. if i weren't working for an electrical company, i ......... in the post office
a. work b. will work c. have worked d. would be working
21. why are you sitting in the dark. let's just sa that if i ..... my electricity bill last month. I.... in the dark now
a. paid/ wouldn't be b. paid/ won't be c. had paid/ wouldn't have been d. had paid/wouldn't be
22. why did tom keep making jokes about me? i don't enjoy .........
a. be laughed at b. to be lauged at c. laughing at d. being lauged at
23. if the world's tropical forest continue to disappear at their present rate. many animal species.....
a. became b. would have become c. will become d. would become
24. ....... resigned, we would have been forced to sack him
a. had he not b. hadn't be c. he had not d. he not had
25. i won't lend you this money..... you promise to pay it back
a. in case b. if c. otherwise d. unless
26. if you ......... us about the bad service, we'd have eaten there
a. didn't tell b. wouldn;t have told c. hadn't told d. had told
27. diana is a wonderfull ballet dancer. she ........ since she was four
a. would be dancing b. has been danced c. has danced d. was danced
28. if he ..... with us last weekend, he............ the beauty of the national park
a. were/ would enjoy b. was/ would be enjoying c. had been/ would enjoy d. had been/ would have enjoyed
29 . that part of the nation park ......... several times this year
a. is repaired b. has repaired c. repaired d. has been repaired

II/ choose the words or phrases that best complete this passage
cuc phuong, the first national park in viet nam was officially open in 1960. it (1).........160km south of west of hanoi spainning ninh binh , hoa binh and thanh hoa province. cuc phuong national park (2)............over 200 spare km of rainforest. it attracks (3)....... tourists and scientists. in 2002, nearly 100000 visitors made their way to cuc phuong. tourists come there to study butterfies, visit caves, hike mountain and look at the (4) ..... tree. many come to see the work done to protect (5)....... species. according, to scientists, there about 2000 different species of (6) ....... and 450 species of fauna in the park
1. a. locates b. located c. is located d. is locating
2. a . covers b. contains c. abandons d. controls
3. a. neither b. either c. both d. every
4. a . 1000- year-old b. 1000- years- old c. 1000 year old d. 1000 years
5. a. dangerous b. wild c. rare d. endangered
6. a. trees b. flora c. vegetation d. flowers

Question 1: Supply the correct forms of the verbs in the brackets.

1.She felt that she (look) .......was being locked................. at.

2.I can't go out because I (not finish) .......haven't finished............. my homework.

3.If you kicked the policeman, you (arrest) ...............would be arrested.......................

4.All students objected to (do) ............doing............... that work.

5. Trang isn't in her room at the moment. She (cook) ...............is doing........... in the kitchen.

6. I can't afford (go) ...................to go..................... on holiday abroad this year.

7. Passengers (travel) ................traveling.....................on this bus bought their tickers in books.

8.I (not use) .......am not using............. the car this evening, so you can have it.

Lười làm bài thế ,suốt ngày lên online math hỏi

a) 2 tam giác ABC và BCD có cùng đường cao là đường cao = đương cao hình thang đáy DC = 2AB --> diện tich BCD gấp đôi

b) dễ dàng cm được diện tích tam giác diện tích tam giác ADC = BDC chúng có phần chung DOC còn lại phần riêng AOD = BOC 

I complete the sentences use the correct from of the words in the brackets

1 would you mind if i (smoke)...smoked......?

2 surface mail is much (cheap) .......cheaper............than airmail

3 he (live)...........has lived.........in this city since 2000

4 the man (sit)......sitting......next to me was very nervous

5 the children (play)...will play........when it started to rain

6 we (learn) .......are learning........French grammar at the moment

7 could you give me some (inform)........information.........?

8 Mr Hung told me(tell)......to tell.......him the truth

9 my father can read (good).......well.......without glasses

II Underline and correct the mistake in the sentences

1 they didn't let me to go => go

...............................................

2 when John is => was four , he came to London with his parents

.......................................................

3 how long have you living => lived here?

..........................................................

4 they are going to school by => on foot

........................................................

5 do you mind if i smoking => smoke in the room?

........................................................

6 his garden isn't as large than => as mine

..........................................................

7 we haven't talked to your sister since => for a long time

............................................................

8 there are much => more than eighty stores in the mall

..........................................................

9 the toys keeping => are keeping in the box are worth 30 dollars

...............................................................

10 this school is different from mine.

..................................................

III Fill in each blank with a suiable preposition

1 this restaurant is famous ...........in.............Chinese food

2 the ambulance will be there ..........by......... a bout 5 minutes

3 bobby started school.......at...........the age of five

4 i am very keen ...........on........... music

5 Na got up late this morning because her alarm clock didn't go.........off..........

6 i'm looking forward ........to..........seeing in june

7 could i help you.........about......your bag?

8 they are traveling to the airport.......by.......a bus.

IV Learning a language is in some way , like(1).........learning..........how to fly or play the piano. There(2).........are....important differences but there is a very important similarity. It is tis: learning how to do such things needs lots (3)......of...practice . It's never simply to "know" something. You must be able to "do" things with that (4).....you.......know. For example it's not enough simple to read a book on(5).....how....to fly an aeroplane . A(6)....book......can give you lots of nformation about how to fly, but if only read a book and then try to (7)......fly....without a great deal of practice first, you will crash and kill(8).....yourself.......The same is true of (9)....learning....the piano. So you thinks it is enough simply to read about it? Can you play the piano without having lots of (10).....pratice.......first?

Ý tớ lộn!

Là 7894 vì số chia hết cho 2 là những số có tận cùng là số chẵn