Cho tam giác ABC có BD, CE là phân giác trong và BD; CE cắt nhau tại I. Qua A vẽ các đường vuông góc với BD, CE lần lượt cắt BC tại M, N. Câu sai là
A. BD là trục đối xứng của AM.
B. AI = IN
C. MN có trục đối xứng là đường thẳng qua I.
D. I là tâm đường tròn ngoại tiếp ΔANC.

Find a mistake in the four underlined parts of the sentence and correct it:
There are dangerous times in a marriage, especially when the wife can come to feel such overburdened that she decides to end the relationship.
A. dangerous times
B. especially
C. such
D. decides

Find a mistake in the four underlined parts of the sentence and correct it:
Our continuously economic growth, the maintenance of our quality of life, and assurance of our security all depend on a abundant, affordable supply of electricity.
A. growth
B. assurance
C. all
D. a

Find a mistake in the four underlined parts of the sentence and correct it:
Had you told me that this was going to happen, I would never believe it.
A. Had you told
B. was going
C. to happen
D. believe

Find a mistake in the four underlined parts of the sentence and correct it:
I didn’t see Mary since she went to live in the capital. 
                                    
A. didn’t see
B. went
C. to live
D. the capital

Find a mistake in the four underlined parts of the sentence and correct it:
 Just as I had got to an interesting part of the story, the doorbell rang.
A. Just
B. had got
C. interesting
D. rang

Find a mistake in the four underlined parts of the sentence and correct it:
He is the only member of the gang who’s identity has remained a secret.
A. the only
B. of
C. who's
D. has remained

Find a mistake in the four underlined parts of the sentence and correct it:
There is nothing more annoying than people interrupt when you are speaking.
A. There is
B. more annoying
C. people interrupt
D. are speaking

Find a mistake in the four underlined parts of the sentence and correct it:
In this summer, I went to Finland with my girlfriend.
A. In this summer
B. went to
C. with
D. girlfriend

Find a mistake in the four underlined parts of the sentence and correct it:
Education and training are an important steps in getting the kind of job that you would like to have.
A. Education
B. an
C. in getting
D. that