1) Vì tam giác ABC cân có AH là đường cao nên AH đồng thời là đường phân giác
( Rightarrow widehat {HAB} = widehat {HAC})
Ta có: HD, HE là 2 đường phân giác của 2 góc kề bù AHB và AHC
bài tập 1
A.1
B.2
C.1
D.2

Who made Singapore belong to Britain?
A.a Malayan Sultan
B.John Crawfurd
C.Sultan Hussein Shah
D.the Temenggong

At first, Singapore ...................
A.was a well-known settlement
B.was the empire Temasek.
C.was part of the Sultanate of Johor, Malaysia
D.was known in the 2nd century AD.

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions.
It is an undeniable fact that children watch too much TV.

A.It’s undeniable that too many children watch TV.
B.It’s undeniable that children don’t watch too many TV programmes.
C.It can’t be denied that children watch too many TV programmes.
D.It’s obviously true that children spend too much time watching TV.

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions.
We couldn’t have managed our business successfully without my father’s money.
A.Had it not been for my father’s money, we couldn’t have managed our business successfully.
B.We could have managed our business successfully with my father’s money.
C.If we could manage our business successfully, my father would give us his money.
D.If we couldn’t have managed our business successfully, we would have had my father’s money.

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions.
Jenny is so creative that we all can rely on her original ideas.
A.Being creative, we can all rely on Jenny for original ideas.
B.So creative is Jenny that we all can rely on her for original ideas.
C.Jenny is such creative girl that we all rely on her for original ideas.
D.Creative though Jenny is, we can rely on her for original ideas.

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions.
We had planned to walk right round the lake, but the heavy rain made this impossible.
A.In spite of the heavy rain we managed to walk half way round the lake as planned.
B.The heavy rain nearly prevented us from walking right round the lake.
C.We would have walked right round the lake even if it had rained heavily.
D.If it hadn’t rained so heavily, we would have walked right round the lake.

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions.
I find myself at a loss to understand Harold’s behavior.
A.I lost contact with Harold, so I couldn’t understand his behavior.
B.I have to lose a lot to understand Harold’s behavior.
C.I understood Harold’s behavior completely.
D.I find Harold's behavior quite incomprehensible.

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions.
Wouldn’t it better to let them know about the alternations to the plan?
A.Why haven’t they have been informed about the new development?
B.Shouldn’t they have been consulted before the scheme was changed?
C.Don’t they think they should be informed about the changes in the plan?
D.We’d better ask them to change the plan, hadn’t we?

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions.
Though he had known about it well in advance, he pretended to be surprised at having a birthday party.
A.He acted surprised about being given a birthday party, but he had known about it a long time before.
B.Despite only pretending to be surprised at the birthday party, he had actually been completely unaware of it.
C.He knew about the birthday party a long time before, yet he wasn't pretending when he acted surprised.
D.He was quite surprised at their throwing him a birthday party, though he could have found out it well before.