1 F

2 T

3 T

4 T

5 F

6 F

1 F

2 T

3 T

4 T

5 F

6 F

b: Sửa đề: AO vuông góc BI

Gọi M là trung điểm của IC

Xét ΔIHC có IO/IH=IM/IC

nên OM//HC và OM=1/2HC

=>OM vuông góc AH

Xet ΔAHM có

MO,HI là đường cao

MO cắt HI tại O

=>O là trực tâm

=>AO vuông góc HM

=>AO vuông góc BI

1 have been built

2 had been damaged

3 go

4 to get

5 is expected

6 was discovered

7 would see

8 would buy

9 will be travelling

10 sitting

12 not to tease

13 to take

14 haven't contacted - went

15 arrived - had already left

16 took

17 will pass

18 was watching - came

19 breaking

13 struck

V

1 to use => to using

2 eating => to eat

3 more healthy=> healthier

4 doesn't => doesn

5 aren't => isn't

6 go => going

7 how many => how much

8 improve => be improved

VI

1 If you hadn't been drunk last night, you wouldn't have got up late

2 If I brought an umbrella, I wouldn't have got wet 

3 If you don't take a raincoat, you will be wet

4 If I weren't afraid of water, I could swim

IV

1 do 

2 to be

3 was waiting

4 went - wouldn't be

5 were

6 smoking

7 is always leaving

8 to study

9 haven't spoken

10 arrive

V

1 wealthy

2 imagination

3 literately

4 phýical

5 observation

6 Married

7 behavior

8 incredible

9 seniority

10 unbelievable

IV

1 do 

2 to be

3 was waiting

4 went - wouldn't be

5 were

6 smoking

7 is always leaving

8 to study

9 haven't spoken

10 arrive

V

1 wealthy

2 imagination

3 literately

4 physical

5 observation

6 Married

7 behavior

8 incredible

9 seniority

10 unbelievable

Chụp câu hỏi lên mới giúp được chứ e

I wish the council wasn't demolishing it

 If I were good at English, I could become a tour guide

"I will hold an event about skin care next month" Mary said

She was given the book " The fault in our stars " as a birthday gift by him

He wishes he could come to his brother's wedding

He advised me not to longer spend most of time chatting on Facebook.

How long did you start searching for some facts in the past ?

My mother used to for me when I married my wife

She was so frightened that she lost control of her car. 

It was such a delicious dessert that I decided to order portion

Because of my sickness, I don't go out

is=>was

leave=>will leave

since=>for

difficult than=>more difficult than

have been=>had been

 so =>too

endangerment=>endangered