Điện hóa trị của các nguyên tố Ba và O trong hợp chất $ BaO $ lần lượt là
A.2+ và 2-
B.1- và 2+
C.1+ và 1-
D.1 và 2

Điện hóa trị của các nguyên tố Al và O trong hợp chất $ A{{l}_{2}}{{O}_{3}} $ lần lượt là
A.3 và 2
B.3+ và 2-
C.2+ và 2-
D.1+ và 2-

Choose the answer among A, B, C, D to complete each of the sentences below:
A sudden idea ……..to the cyclist that he might try the new method.
A.took part
B.happened
C.occurred
D.took place

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
You should have ___________ your composition carefully before you hand it in
A.gone over
B.looked in
C.seen through
D.thought of

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
Guitars, flutes, organs, drums are called musical ………..
A.singers
B.composers
C.festivals
D.instruments

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
The Vietnam Idol ………. includes auditions, semi-final and finals.
A.process
B.performance
C.method
D.way

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
Quan Ho singing ………. in Bac Ninh Province.
A.originated
B.recognized
C.consisted
D.reversed

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
The winner of tonight's talent ………. will be announced soon.
A.contest
B.performance
C.show
D.concert

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
Jack was wearing blue jeans and a torn T-shirt, while all other guests had on formal dinner wear. He really _______.
A.stayed out
B.came out
C.stood out
D.look out

Choose the answer (A, B, C, D) which best fits the space
He _________ his mother/ his mother's side of the family.
A.takes up
B.takes over
C.takes after
D.takes on