Trong các chất: NaOH, Mg(OH)₂, Ba(OH)₂, KOH, chất có tính bazơ yếu nhất là

Khi đun nóng axit axetic với ancol etylic có mặt H₂SO₄ đặc, thu được este có công thức là

Kim loại được dùng làm chất trao đổi nhiệt trong lò phản ứng hạt nhân là

Quặng hemantit nâu có thành phần chính là

Dung dịch chứa nhiều chất tan nào sau đây là nước mềm?

Tính chất hóa học chung của kim loại là

Tripeptit (Ala–Gly–Ala) không phản ứng với chất nào sau đây?

Kim loại Al không phản ứng với chất nào sau đây?

Cho CaO tác dụng với dung dịch HCl dư ta thu được muối là

Neil denies __________ the window.

A. breaking

B. break

C. breaks

D. to break

The university required the students __________ all the lectures.

A. to attend

B. be attended

C. attended

D. attending

My mother forgot _____ the car key insides, so she had to come in again.

A. leave

B. left

C. to leave

D. leaving

When I __________ at the party, I __________ him playing the piano.

A. arrived /saw

B. was arriving/see

C. arrived/ was seeing

D. arrive/ saw

In some public places, visitors are requested to keep ______ the grass.

A. off

B. aside

C. out

D. away

The dentist advised me ________ my teeth three times a day.

A. brush 

B. to brush

C. brushing

D. is brushing

This coffee is too ________ to drink. (heat)

The two girls take after their mother very much in appearance. 

A. appear

B. cancel

C. resemble

D. consider

It is generally accepted that in today's society women have access ________ education and can promote themselves much more easily than years ago.

A. to

B. up

C. on

D. for

I was late for school this morning because my alarm clock didn't ______.

A. carry out

B. cut down

C. get on

D. go off

I wonder why Jim ________ so nice to me today. He isn't usually like that.

A. is being

B. have been

C. is

D. have being

We had a long way to go so we _____ off very early.

A. had

B. put

C. set

D. made

I didn't understand the accent when I first moved here, but I quickly ______ it.

A. used to

B. am used to

C. got used to

When you come tomorrow why not _______ your brother with you?

A. fetch

B. take

C. bring

D. carry

His comments ________ little or no relation to the facts and the figures of the case.

A. reflect

B. bear

C. give

D. possess

I used to idolize David Beckham because of his dedication and talent.

A. hate

B. impress

C. worship

D. detest

A special committee was set up to ________ on the problem of football hooliganism.

A. report

B. inform

C. research

D. investigate

After failing many times in ____ a new dish she made a decision ____.

A. creating - giving up

B. to create - to give up

C. to create - give up

D. creating – to give up

The maintenance of this company is dependent on international investment.

A. affective

B. self-reliant

C. self-restricted

D. reliant

All students are revising carefully, for the final test is approaching soon.

A. going fast

B. reaching fast

C. coming near

D. getting near

In spite of poverty and dreadful conditions, they still manage to keep their self-respect.

A. self-reliant

B. self-restraint

C. self-esteem

D. self-assured

At last, Huong made a determined effort to get a scholarship so that he could have chance to study overseas.

A. tenacious

B. serious

C. unresolved

D. necessary

A. look into

B. look up to

C. look after

D. look for

The TV announcer apologized for the breakdown and said that normal service ________ as soon as possible.

A. would be resumed 

B. resumed

C. be resumed

D. would be resuming

The accident _______ was the mistake of the driver.

A. causing many people to die

B. caused great human loss

C. to cause many people die

D. which causes many people

A study has been done to determine how the recent change in government policies ______.

A. has affected the small business sector

B. have affected the small business sector

C. the small business sector was affected

D. affecting the small business sector

A. I don't like emails.

B. That's true!

C. I’d prefer text messaging.

D. That’s OK!

A: Do you find it interesting to go to the cinema on your own?

B: ______________.

A. No, not at all.

B. What a pity!

C. Never mind.

D. You're welcome.

When her husband was in the army, Mary _______ to him twice a week.

A. was reading

B. wrote

C. was written

D. had written

A. carry out

A. carry out

B. pay back

C. get on

D. hold up

Your brother was being a nuisance, so I told him to ________. 

A. carry out

B. cut down

C. go away

D. hold up