Cho tam giác ABC vuông tại B có BC = \(\sqrt{7}\)cm, AC = 4cm. Độ dài cạnh AB là:
     A. 3cm                      B. \(\sqrt{33}\)cm                   C. \(\sqrt{23}\)cm                    D. 9cm

giải thick hộ mik vs

Ex2 : Change these interrogatives into reported speech . 

1. “ Are there any chairs in this  room ?” he asked her son

 =>............................................................................................

2.“ Can you use a computer ? “ The teacher asked Hung 

=>...........................................................................................

3.“ Are you working hard for the coming exam ? “ asked Linda =>........................................................................................

4.“ Have you learnt English for four years ? “ The teacher asked Lan =>...................................................................................................

5.“ Will they leave for Hue tomorrow ?” asked David

 =>.................................................................................................

Read the text below and think of the word which best fits each gap. Use only ONE word in each gap.

Until the late 1920s, motion pictures were silent except (1) ________ the musical accompaniment

provided by theater owners in the form of live orchestras. Up (2) ________ this point, movies had enjoyed a wide

degree of popularity, but they still remained a secondary form of entertainment, largely (3) ________ to their lack

of sound. Everything changed (4) ________ 1926 when Warner Brothers introduced a new sound-on-disc system.

In this system, sound effects and music were (5) ________ on wax record. In order to exhibit this new (6)

________, Warner Brothers showed “Don Juan”, the first (7) ________ picture to have a pre-recorded score and

sound effects. Although “Don Juan” was enjoyed very much, many movie studios still refused to adapt (8)

________ talking picture technology, believing that “talkies” would never replace silent pictures. (9) ________,

“The Jazz Singer”, an interesting film with sound, in October (10) ________ 1927 changed these options, and in

doing so, changed the history of motion pictures forever.

Read the text below and look carefully at each line. Some of the lines are correct, and some have a word 
which should not be there. If a line is correct, put a tick () by the number on your answer sheet. If a line 
has a word which should not be there, write the word on your answer sheet. There are two examples at the 
beginning.
0 The authorities of Bangladesh are doing their best for 0. ___________
00 the victims of the floods which have been covered 00. ____been____
1 many of low-lying coastal villages. The floods were 1. _____________
2 caused by a combination of very high spring tides and 2. _____________
3 too heavy rainfall in the mountains, which, according to 3. _____________
4 government sources, could not to have been predicted. 4. _____________
5 The government has called in the army to the affected 5. _____________
6 areas, and they are handing out a food to the people 6. _____________
7 who could have managed to get away from the flood 7. _____________
8 by moving to more higher ground. The authorities 8. _____________
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9 estimate that there are must be several thousand 9. _____________
10 people who are in need of urgent medical attention. 10.

Exercise 9: Write a suitable conditional sentences for the following situations .

1. Working so much will make you tired.

⇨       If you ………………….

1. We didn’t visit the museum because we didn’t have time.

⇨       We would …………………..

2. People don’t do enough exercise, so there are a lot of heart diseases.

⇨       If people ………………………..

3. Without you, I would have given up  it years ago.

⇨       If it hadn’t been ……………………….

4. It was overeating that caused his heart attack

⇨       If ……………………………………………..

5. Keeping calm is the secret of passing your driving test.

⇨       As long as …………………………………………

6. We couldn’t have managed without my father’s money.

⇨       If it ……………………………………………………..

7. Without his help we would all have died.

⇨       If it ………………………………………………………….

8. If it doesn’t rain soon, millions of pounds’ worth of crops will be lost

⇨       Unless …………………………………………………………….

9. It was the goalkeeper who saved the match for us.

⇨       If it hadn’t …………………………………………….

10. The only reason the party was a success was that a famous film star attended.

⇨       Had it not ………………………………………………..

11. Sally might not bring her camera to the party, so I’ll take mine.

ð I’ll take my camera to the party in case……………………..

Exercise 8: Rewrite the following sentences, using conditional sentences type 2 or 3:
     Eg1: She is very shy, that’s why she doesn’t enjoy parties.
⇨       If she weren’t shy, she might enjoy parties.
     Eg2: You didn’t tell me we had run out of bread, so I didn’t buy any.
⇨       If you had told me we had run out of bread I’d have bouhgt some
1.   He doesn’t take any exerrcises, that’s why he is so unhealthy.
…………………………………………………………………………………..
2.   I didn’t see the signal, so I didn’t stop.
……………………………………………………………………………………
3.   We only came by bus because there were no taxis.
……………………………………………………………………………………
4.   I haven’t  much time so I read very little.
…………………………………………………………………………………
5.   We have no ladder so we can’t get over the wall.
…………………………………………………………………………………
6.   We didn’t go by air only because we didn’t enough money.
…………………………………………………………………………………..
7.   We didn’t listen carefully perhaps that’s why we made this mistake.
……………………………………………………………………………………
8.   I live near my office, so I don’t spend much time traveling to work.
……………………………………………………………………………………
9.   People drive very fast. That’s why there are so many accidents.
……………………………………………………………………………………
10.                    She didn’t know you were in hospital, so she didn’t visit you.
……………………………………………………………………………………

Exercise 7: Put the verbs in brackets into the correct form:
1.If I see him I (give) …………………. him a lift
2.I shouldn’t have believed it if I (not/ see)………………. it with my own eyes
3.What (you, do)…………………… if you found a burglar in your house
4.If you (speak)…………………….. more slowly he  might have understood you.
5.I (bring)……………… you another if you don’t like this one.
6.Unless I have a quiet room I (make)…………………. enquiries for you.
7.Should you require anything else please (ring)……………. the bell for the attendant.
8.If I (win)…………. a big prize in a lottery I’d give up my job.
9.He might get fat if he (stop)………………. smoking.
10.If he had known the whole story he (not/ be)……………… so angry.
11.If I (try)…………….. again I think that I would have succeeded.
12.I (keep)……………… a horse if I could afford it.
13.If I were sent to prison (you, visit)……………………………… me?
14.If I lend you $10 when( you ,repay)……………………………. me?
15.If he (work)…………… hard today can he have a holiday tomorrow?