1. Somebody is having a party. ~ Oh, really? .....Who are being invited there?..

2. l was reading something. ~ Oh? ..Is it interesting?.....

3. I've learnt something. ~ Go on, tell me......something about your study...... . ..

4 .We should do something. ~ Yes, I know, but . ...what should we do?...

5. Someone is looking for you, ~ Oh? . ..Who is he?....

6. I'm looking for someone. - Maybe I can help......How does he look like?.......

7. Rachel is planning something. ~ Is she? ...What is she planning.....

8. Somebody has moved in next door. ~ Oh, really? ......Should we invite for a meal?......

9. Something is worrying me. ~ Well, tell me......Who he is?.....

10. I want to meet someone. ~ What do you mean?.....Maybe I can help you......

b, Gọi \(\left(d_3\right):y=ax+b\left(a\ne0\right)\) là đt cần tìm 

\(P\left(1;3\right)\in\left(d_3\right)\Leftrightarrow a+b=3\left(1\right)\\ \left(d_3\right)\perp\left(d_1\right)\Leftrightarrow2a=-1\Leftrightarrow a=-\dfrac{1}{2}\left(2\right)\\ \left(1\right)\left(2\right)\Leftrightarrow\left\{{}\begin{matrix}a=-\dfrac{1}{2}\\b=3+\dfrac{1}{2}=\dfrac{7}{2}\end{matrix}\right.\)

Vậy đt cần tìm là \(y=-\dfrac{1}{2}x+\dfrac{7}{2}\)

c, Gọi \(\left(d\right):y=cx+d\left(c\ne0\right)\) là đt của (d)

\(\left(d\right)//Ox\Leftrightarrow d=y\\ C\left(0;2\right)\in\left(d\right)\Leftrightarrow d=2=y\\ \Leftrightarrow\left(d\right):y=2\)

PTHDGD của (d) và (d₁) là \(2x=2\Leftrightarrow x=1\Leftrightarrow y=2\Leftrightarrow A\left(1;2\right)\Leftrightarrow OA=1\)

PTHDGD của (d) và (d₂) là \(\dfrac{1}{2}x=2\Leftrightarrow x=4\Leftrightarrow y=2\Leftrightarrow B\left(4;2\right)\Leftrightarrow OB=4\)

\(AB=OA+OB=5\)

Gọi D là chân đường cao từ O tới AB

\(\Leftrightarrow OD=2\) (do \(D\in\left(d\right):y=2\))

Vậy \(S_{ABO}=\dfrac{1}{2}OD\cdot AB=5\left(đvdt\right)\)

1 Yesterday the plane took off earlier than I expected

2 My mother looks after us more carefully than my father

3 They cut the big cake into smaller parts than I thought

4 My sister even tells me off more often than my mother does

5 Who saw you off yesterday?

6 It is cold today so I put on more warm clothes than usual

7 Yesterday my mother picked my up later than usual

8 You are the pretties girl I have ever known

9 Unless you listen attentively to your teacher, you won't catch up with your friends

10 By far, "The Little Prince" has been my favorite book

39 be on time for your interview

40 tall is she

41 What is she like?

42 have you been in this city?

43 is the price of those books

44 How did she greet friends?

45 What did she walk to the station for

2 is going to b

3 am writing

4 has also typed

5 has been planting

6 has written

7 have just heard

8 does the play start

9 have worked

10 have practise

11 go

1 Mary thanked me for looking after her children when she was away

2 The mother warned her son not to play near the dog

3 Tim insisted on taking Laura to the airport

4 Miss Hoa thanked me for inviting her to the dinner

5 He suggested going to the movies

6 The boy denied cheating in the exam

7 chưa có từ gọi ý