Đáp án đây nhé:

1) Is this the ring which you were looking for?

2) If Mary called, I would invite her to the concert, but she doesn't.

3) Tuoi Tre is a daily newspaper which is widely read by both teenagers and adults.

4) We really enjoy watching the firework which is displayed every / on New Year's Eve.

1. Is this/ring which you/ were/look for?

is this the ring which you were looking for?

2. If Mary/call, I/ invite her/the concert, but she doesn't.

If mary called. I would invite her to the concert, but she didn't

3. Tuoi Tre/be/daily newspaper which/widely read/both teenagers and adults.

Tuoi tre is the daily newspaper which is widely read by both teenagers and adults

4. We/really enjoy/watch the firework which/be displayed/New Year's Eve

we really enjoy watching the firework which is displayed on New year's eve

1 amn't I => aren't I

2 wide => widely

3 having => to have

4 introduce => introduced

5 meet => met

1 amn't I => aren't I

2 wide => widely

3 having => to have

4 introduce => introduced

5 meet => met

17, D

18, D ( vì sau nó là một động từ nên từ cần điền là một trạng từ để bổ sung ý nghĩa cho động từ)

19, C

F. CORRECTION

I. Choose the underlined word or phrase (A, B, C or D) that needs correcting.

1. If a drop of oil is placed in a glass of water, it would -> does float to the top. A B C D

2. The Tuoi Tre is a daily newspaper that is wide -> widely read by both teenagers and adults. A B C D

3. My parents wouldn’t let me staying -> stay up late when I was a child. A B C D

4. Her children are used to picking -> being picked up after school every day. They don’t have to walk home. A B C D

5. I’m usually right about the weather, amn’t -> aren't I? A B C D

6. Could I change seats with you? I’d like sitting -> to sit next to my friends. A B C D

7. Watch -> Watching television to the exclusion of all other activities is not a healthy habit for a growing child. A B C D

8. Hans is only fourteen, but he seems enough old -> old enough to stay out until ten. A B C D

9. I think that’s an interesting thought, isn’t that -> it? A B C D

10. Greeting enough sleep is important in order not -> not to fall asleep is class. A B C D

1. The bad weather didn’t make my flight be delayed, but the terrorism does -> did. A B C D

12. Kevin had took -> taken home lots of nice souvenirs last time, so he didn’t buy anymore. A B C D

13. A tour -> Tour guide was showing the tourists around when a something fell down from the sky. A B C D

14. If you decide to start the -> a trip, you must reserve a seat in advance on planes or trains. A B C D

15. I bet you will never have the nerve -> not to start an expedition to an Amazon rainforest. A B C D

16. My trip to the countryside was fantastic. The locals were extremely welcome -> welcoming. A B C D

17. Did you have a chance to do any sightsee -> sightseeing? A B C D

18. I find it absolutely astonished -> astonishing that you didn’t like Paris. A B C D

19. You’re a -> the third person to ask me about the trip. A B C D

20. When he was ten, he taught himself to play a -> the violin. A B C D

1,Mary has leant French for 6 year

-->It's  6 years since Mary last learnt French

2,My uncle has been a worker in that factory for 10 year

-->My uncle started being a worker in that factory 10 years ago

3,How long have your family read Tuoi Tre Newspaper

-->When did your family begin reading TT Newspaper?

4,My old friend stared working on that farm in 2005

-->Since 2005, my old friend has worked on that farm

5,Jane's grandma hasn't planted trees in the garden for 5 months

-->Jane's grandma stopped planting trees in the garden 5 months ago

6,We haven't seen Mary since we left the university

-->We last saw Mary when we left the university

7,She hasn't gone out with him for 5 months

-->The last time she went out with him was 5 months ago

Bài 5 hình 1: (tự vẽ hình nhé bạn)
a) Xét ΔABD và ΔACB ta có:
\(\widehat{BAD}\)= \(\widehat{BAC}\) (góc chung)
\(\widehat{ABD}\)= \(\widehat{ACB}\) (gt)
=> ΔABD ~ ΔACB (g-g)
=> \(\dfrac{AB}{AC}\) = \(\dfrac{BD}{CB}\) = \(\dfrac{AD}{AB}\) (tsđd)
b) Ta có: \(\dfrac{AB}{AC}\) = \(\dfrac{AD}{AB}\) (cm a)
=> \(AB^2\) = AD.AC
=> \(2^2\) = AD.4
=> AD = 1 (cm)
Ta có: AC = AD + DC (D thuộc AC)
      => 4   =   1   + DC
      => DC = 3 (cm)
c) Xét ΔABH và ΔADE ta có: 
   \(\widehat{AHB}\) = \(\widehat{AED}\) (=\(90^0\))
   \(\widehat{ADB}\) = \(\widehat{ABH}\) (ΔABD ~ ΔACB)
=> ΔABH ~ ΔADE
=> \(\dfrac{AB}{AD}\) = \(\dfrac{AH}{AE}\) = \(\dfrac{BH}{DE}\) (tsdd)
Ta có: \(\dfrac{S_{ABH}}{S_{ADE}}\) = \(\left(\dfrac{AB}{AD}\right)^2\)= \(\left(\dfrac{2}{1}\right)^2\)= 4
=> đpcm

Tiếp bài 5 hình 2 (tự vẽ hình)
a) Xét ΔABC vuông tại A ta có:
\(BC^2\) = \(AB^2\) + \(AC^2\)
\(BC^2\) = \(21^2\) + \(28^2\)
BC = 35 (cm)
b) Xét ΔABC và ΔHBA ta có:
\(\widehat{BAC}\) = \(\widehat{AHB}\) ( =\(90^0\))
\(\widehat{ABC}\) = \(\widehat{ABH}\) (góc chung)
=> ΔABC ~ ΔHBA (g-g)
=> \(\dfrac{AB}{BH}\) = \(\dfrac{BC}{AB}\) (tsdd)
=> \(AB^2\) = BH.BC
=> \(21^2\) = 35.BH
=> BH = 12,6 (cm)
c) Xét ΔABC ta có:
BD là đường p/g (gt)
=> \(\dfrac{AD}{DC}\) = \(\dfrac{AB}{BC}\) (t/c đường p/g)
Xét ΔABH ta có: 
BE là đường p/g (gt)
=> \(\dfrac{HE}{AE}\) = \(\dfrac{BH}{AB}\) (t/c đường p/g)
Mà: \(\dfrac{AB}{BC}\) = \(\dfrac{BH}{AB}\) (cm b)
=> đpcm
d) Ta có: \(\left\{{}\begin{matrix}\widehat{HBE}+\widehat{BEH}=90^0\\\widehat{ABD}+\widehat{ADB=90^0}\\\widehat{HBE}=\widehat{ABD}\end{matrix}\right.\)
=> \(\widehat{BEH}=\widehat{ADB}\)
Mà \(\widehat{BEH}=\widehat{AED}\) (2 góc dd)
Nên \(\widehat{ADB}=\widehat{AED}\)
=> đpcm

A = {6;12}

b: B={90;180;270}

Con đĩ này ngu chết mẹ luôn