Hoà tan hỗn hợp gồm : K₂O, BaO, Al₂O₃, Fe₃O₄ vào nước (dư), thu được dung dịch X và chất rắn Y. Sục khí CO₂ đến dư vào dung dịch X, sau khi các phản ứng xảy ra hoàn toàn thu được kết tủa là :

A. Al(OH)₃.

B. Fe(OH)₃.

C. BaCO₃

D. K₂CO₃.

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.

He should have his visa _____ before it expires if he does not want to be deported.

A. extend

B. Extending

C. extended

D. extension

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.

Janet admitted _____ the car without insurance.

A. to be driving

B. being driven

C. to have driven

D. having driven

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.

If he improved his IT skills, he _____ a job.

A. will easily get

B. would easily get

C. will easily have got

D. would easily have got

Mark the letter A, B,C or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions
New sources of energy have been looking for as the number of fossil fuels continues to decrease.

A.sources of energy

B.been looking

C.number

D.continues

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each

of the following questions from 8 to 19.

I’ve never really enjoyed going to the ballet or the opera; they’re not really my ______.

A. sweets and candy

B. biscuit

C. piece of cake

D. cup of tea

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions from 8 to 19.

It is claimed that new nuclear power plants ______ to be safer than the current ones are soon built.

A. to design

B. designing

C. designed

D. are designed